Trees for South Florida–Part 3

Trees of South Florida–Part 3

Jacaranda mimosifolia - Florida Section F LARE Landscape Architect Exam Study Guide

Today, we continue our study of trees and large shrubs that are suitable for landscape architects to specify in planting plans for Dade County and other areas of South Florida.

Since there are so many great trees adapted to grow in the mild South Florida climate, this list is broken up into several articles.

Landscape architect candidates should be knowledgeable about the following species for southern Florida landscapes for Section F of the LARE.


Jacaranda mimosifolia (jacaranda)

Jacaranda mimosifolia - Florida Section F LARE Landscape architect exam study guide
Jacaranda mimosifolia

Soft, delicate, fernlike, deciduous foliage and dense terminal clusters of lavender-blue, lightly fragrant, trumpet-shaped flowers make this large, spreading tree an outstanding specimen planting. The striking blooms can appear any time from April through August (most often May), and are sometimes present before the fresh, new, light green leaves appear in spring. Flowering is reportedly best following a winter with several nights in the upper 30’s. Jacaranda may flower best when grown in poor soil. Jacarandas can reach 25 to 40 feet in height with an equal or greater spread, and the bent or arching trunks are covered with light grey bark. The light, dappled shade makes Jacaranda well-suited for cooling patios, but it probably should not be used near pools due to the abundant leaf and flower drop. Jacaranda makes an ideal street tree, creating a spectacular sight when in full bloom. The arching branch habit is ideal for creating a canopy over a street or boulevard. Be sure to plant only those trees which have one central trunk and major limbs well-spaced apart for street tree and other high-use areas. Unpruned trees can become hazardous as they split apart at the crotches. Once properly trained and pruned, Jacaranda is fairly strong-wooded and less messy than Royal Poinciana. Heaviest-flowering when grown in full sun, small trees of Jacaranda can tolerate light shade and will grow quickly. They thrive in sandy, well-drained soils but should be watered during dry periods. Prune branches so they remain less than half the diameter of the trunk to help keep the plant intact and increase durability. Read more about this beautiful flowering tree here.


Jatropha integerrima (peregrina)

Jatropha integerrima - Florida Section F LARE Landscape Architect exam study guide
Jatropha integerrima

This slender-stemmed, multi-trunked tropical evergreen tree or large shrub, a native of Cuba, reaches 15 feet in height with an equal spread, and has unusual 7-inch-long leaves varying in shape from oblong, fiddle-shaped, or even-lobed. The 1-inch-wide red flowers are produced year-round in beautiful clusters held upright above the foliage and helps make fire-cracker an interesting specimen plant. The seed capsules which follow hold several smooth, speckled, and toxic seeds, a fact which must be considered when placing this plant in the landscape; it should be kept out of the reach of children. Jatropha makes a delightful red-flowered accent in a shrub border planted to attract attention to an area. It flowers nearly year round and so is quite popular as a patio tree or garden accent. Multiple trunks and stems originate near the ground forming a symmetrical, weeping clump of thinly-clothed branches. The tree can be staked and trained to grow with one trunk for two or three feet. This is a nice way to display the plant as an accent or specimen. Do not expect this small tree to provide shade, but it will attract hummingbirds and butterflies. Peregrina should be grown in full sun or partial shade on well-drained soil. Full sun plants flower best. It is not salt-tolerant. Click here for more information.


Juniperus silicicola (southern red cedar)

Juniperus silicicola - Florida Section F LARE Landscape Architect exam study guide
Juniperus silicicola

This densely-foliated, wide pyramidal, columnar or oval evergreen grows fairly quickly, ultimately reaching heights up to 40 feet with a 25-foot spread. Some individual plants grow wider than tall as they grow older. Some botanists do not make a distinction between Juniperus silicicolaand Juniperus virginiana. Its fine-textured, medium green leaves, and drooping branchlets help to soften the rather symmetrical, oval juvenile form. Mature specimens of Southern Redcedar take on a flat-topped, almost windswept appearance, making them very picturesque. Bark and trunk on older specimens take on a delightful, ‘old-tree’ look. The dense growth and attractive foliage make Southern Redcedar a favorite for windbreaks, screens, and wildlife-cover for large-scale landscapes. Its high salt-tolerance makes it ideal for seaside locations. Redcedar can make a nice Christmas tree, and the fragrant wood is popular for repelling insects. Cedar Key, FL, once had extensive redcedar forests before the lumber was extensively harvested and the wood used for chests and pencils. Although not currently used often as a street tree, its wood is strong, the foliage is clean, and the fruit is small making it a suitable candidate. There are some nice examples of street tree use in southern cities. With proper pruning to remove lower branches, it should adapt well to street-scapes. Planted in full sun or partial shade, Southern Redcedar will easily grow on a variety of soils, including clay. Growth may be poor in landscapes which are over-irrigated. Plants are difficult to transplant due to a coarse root system, except when quite small. Water until well-established and then forget about the tree. It performs admirably with no care, even on alkaline soil and along the coast. Usually insects and diseases are not a problem if grown in the full sun. There may be local restrictions on planting this tree near apple orchards because it is the alternate host for cedar-apple rust. Read more about it here.


Lagerstroemia indica (crape myrtle)

Lagerstroemia indica - LARE Florida Section F Landscape Architect Registration License Study Guide
Lagerstroemia indica

A long period of striking summer flower color, attractive fall foliage, and good drought-tolerance all combine to make crape myrtle a favorite small tree for either formal or informal landscapes. It is highly recommended for planting in urban and suburban areas.

Available in all shades of white, pink, red, or lavender, the 6- to 12-inch-long clustered blooms appear on the tips of branches during late spring and summer in USDA hardiness zones 9 and 10, and summer in other areas. The individual flowers are ruffled and crinkly as to appear made of crepe paper. The smooth, peeling bark and multi-branched, open habit of crape myrtle make it ideal for specimen planting where its bright red to orange-colored fall leaves add further interest. Most forms of the tree are upright, upright-spreading, or vase-shaped, spreading out as they ascend. Most tree types grow to 20 to 25 feet tall although there are more dwarf types available. The upright, vase-shaped crown makes the tall-growing selections well-suited for street tree planting.

Pruning should be done in late winter or early in the spring before growth begins because it is easier to see which branches to prune. New growth can be pinched during the growing season to increase branchiness and flower number. Pruning methods vary from topping to cutting crape myrtle nearly to the ground each spring to the removal of dead wood and old flower stalks only. Topping creates several long, thin branches from each cut which droop down under the weight of the flowers. This practice disfigures the nice trunk and branch structure. Lower branches are often thinned to show off the trunk form and color. You can remove the spent flower heads to encourage a second flush of flowers and to prevent formation of the brown fruits. Since cultivars are now available in a wide range of growth heights, severe pruning should not be necessary to control size. Severe pruning or topping can stimulate basal sprouting which can become a constant nuisance, requiring regular removal. Some trees sprout from the base of the trunk and roots even without severe heading. This can be a maintenance nuisance.

Crape myrtle grows best in full sun with rich, moist soil but will tolerate less hospitable positions in the landscape just as well, once it becomes established. It grows well in limited soil spaces in urban areas such as along boulevards, in parking lots, and in small pavement cutouts if provided with some irrigation until well established. They tolerate clay and alkaline soil well. However, the flowers of some selections may stain car paint. Insect pests are few but crape myrtle is susceptible to powdery mildew damage, especially when planted in some shade or when the leaves are kept moist. There are new cultivars (many developed by the USDA) available which are resistant to powdery mildew and aphids.

Many cultivars of crape myrtle are available: hybrid ‘Acoma’, 14 to 16 feet tall, white flowers, purple-red fall foliage, mildew resistant; hybrid ‘Biloxi’, 25 feet tall, pale pink blooms, orange-red fall foliage, hardy and mildew resistant; ‘Cherokee’, 10 to 12 feet, bright red flowers; ‘Powhatan’, 14 to 20 feet, clear yellow fall foliage, medium purple flowers. The hybrid cultivars ‘Natchez’, 30 feet tall, pure white flowers, resistant to aphids, one of the best crape myrtles; ‘Muskogee’, 24 feet tall, light lavender flowers, and ‘Tuscarora’, 16 feet tall, dark coral pink blooms, are hybrids between Lagerstroemia indica and Lagerstroemia fauriei and have greater resistance to mildew. The cultivar ‘Crape-Myrtlettes’ have the same color range as the species but only grow to three to four feet high. The National Arboretum releases are generally superior because they have been selected for their disease resistance. These releases may prove more resistant to powdery mildew in the deep south, although further testing needs to be done to confirm this. Read more about crape myrtles here.


Lagerstroemia speciosa (crape myrtle)

Lagerstroemia speciosa - Florida Section F LARE Landscape architect exam study guide
Lagerstroemia speciosa

This is one of only a few deciduous trees which grow in tropical and subtropical areas of the country. A profusion of large, three-inch wide, bright pink to lavender blooms appear in dense, foot-long, terminal panicles from June to July, making queen’s crape myrtle a spectacular specimen or street tree. This large, upright rounded, deciduous tree is clothed with 12-inch-long, dark green, oblong, leathery leaves which turn attractively red before falling in winter. Queen’s crape myrtle can reach 40 to 60 feet in height and a spread of 30 to 40 feet. The attractive bark is smooth, mottled and peeling. In India, the wood is used for railroad ties and construction. The bark is thin and easily injured. Queen’s crape myrtle will grow in full sun on a wide range of well-drained soils but is not salt-tolerant. Where there are no overhead restrictions, this makes a nice large street tree due to the upright-spreading habit of growth. This reduces the regular pruning needed to remove lower drooping branches on some other trees. However, when the trees are young, some lower branches will need to be removed for street tree planting to create clearance for passage of pedestrians and vehicles. The tree should tolerate storms well having hard wood with flexible branches, as long as they are well spaced along the trunk and not clumped together growing from one point on the trunk. Plants should be watered faithfully and protected from frost. Not a tree to plant and forget, queen’s crape myrtle appreciates regular fertilization or leaves become chlorotic. It will tolerate alkaline soil. Find out more information about this species here.


Magnolia virginiana and cvs. (sweetbay magnolia)

Magnolia virginiana - Florida Section F LARE Landscape Architect Exam
Magnolia virginiana

Sweetbay Magnolia is a graceful southern, evergreen to semi-evergreen, wide columnar tree, ideal for use as a patio tree or specimen. It can grow to a mature height of 40 feet in the north or to 60 feet in the south. Trees glimmer in the wind due to the whitish-green undersides of the leaves. They are very noticeable as you drive by them on interstates along water-logged woodlands. The tree provides excellent vertical definition in a shrub border or as a free standing specimen and flourishes in moist, acid soil such as the swamps in the eastern U.S. and along stream banks. The creamy-white, lemon-scented flowers appear from June through September, and are followed by small red seeds which are used by a variety of wildlife. It can be trained into a multi-trunked, spreading specimen plant, or left with the central leader intact as a wide column.

Sweetbay Magnolia makes an excellent tree for planting next to buildings, in narrow alleys or corridors, or in other urban areas with limited space for horizontal crown expansion. It has not been planted extensively in downtown urban areas, but its flood and drought tolerance and narrow crown combine to make it a good candidate. It usually maintains a good, straight central leader, although occasionally the trunk branches low to the ground forming a round multi-stemmed, spreading tree. It should be grown and planted more often.

Sweetbay magnolia roots easily from softwood cuttings, grows freely near coastal areas, and is happiest in southern climates. It is thriving in the Auburn Shade Tree Evaluation trials in Alabama without irrigation. However, in the confined soil spaces typical of some urban areas, occasional irrigation is recommended.

The species is deciduous in USDA hardiness zones 7 and 8 (evergreen farther south) but the variety australis and cultivar ‘Henry Hicks’ are evergreen; ‘Havener’ has larger flower petals. Read more about this native magnolia here.


Mangifera indica (mango)

Mangifera indica - Florida Section F LARE Landscape Architect Exam study guide
Mangifera indica

An abundant harvest of juicy, red-gold fruit and attractive dark green, tropical foliage make Mango a popular home landscape item in very large yards for warm climates. The trees grows to be 30 to 45 feet tall and almost 50 feet wide, so allow plenty of room for growth. New foliage is a brilliant purple-red, and flower and fruit clusters extend well beyond the long, glossy leaves. The tree is covered with very showy, white flower spikes in March and early April. Mango trees grow quickly into round, multibranched, dense, spreading shade trees but placement is limited due to the falling fruit. Some people are allergic to the pollen, the sap and even the fruit. Mango trees grow best in full sun on fertile, well-drained soils and should have ample moisture. Leaf, flower, twig and fruit litter is a constant nuisance for some, and branches are subject to breakage during severe windstorms. It seems like something is always falling from a Mango tree to litter the lawn. Place it in a bed with other plants to hide the litter.

There are several cultivars available which have been selected for fruit quality: `Keitt’, `Hent’, `Edward’, `Glenn’, `Haden’ and others are best for Florida. Read more about mangos here.


Musa spp. (banana)

Musa species - Florida Section F Landscape Architect Exam study guide
Musa species

Large, fleshy, upright stalks topped with soft, smooth, arching leaves signifies the banana plant. Ranging from six feet for the dwarf species to over 30 feet for the largest types, banana trees are guaranteed to lend a tropical flavor to any landscape setting. The broad, tender leaves are easily torn by winds and plants should be located in a sheltered area to prevent this. The easily-grown banana tree is ideal for planters near the pool, located around garden ponds, or clustered together for an exotic effect. The unusual reddish-purple flowers are followed by clusters of upwardly-pointing green fruit, maturing to a beautiful yellow.

Growing best on fertile, moist soil, bananas will thrive in full sun or partial shade and should be protected from both wind and cold. Plants respond well to regular fertilization. Too many suckers should not be allowed to develop since this will decrease the ability of any one plant to produce a good bunch of fruit. By allowing suckers to develop only at periodic intervals, a succession of fruiting can be obtained. Banana bunches should be harvested when the fruit is still green and allowed to ripen in a cool, dark place. It produces fruit in USDA hardiness zones 8b and 9 only when winter temperatures stay above freezing. Plants killed to the ground which sprout from the soil in the spring will not produce fruit until the following year.

Many different species of banana are available. Some ornamental types are grown for foliage or flowers. Musa coccinea has brilliant red bracts, while Musa rosea has pink bracts. Both hold up very well as cut flowers. Musa acuminata, ‘Dwarf Cavendish’, is one of the best fruit cultivars. It has large bunches with large fruit and the plant’s small size makes it easier to protect from wind. The tall-growing ‘Ladyfinger’ has small bunches of small bananas but they are very thin-skinned and delicious. Musa velutina grows three to four feet tall with three-foot leaves that are green above and bronzy beneath. The upright pink bracts has orange flowers and yield velvety pink fruit. Read more about the genus Musa here.


Myrcianthes fragrans (Simpson’s stopper)

Myrcianthes fragrans - Florida Landscape Exam Section F LARE study guide
Myrcianthes fragrans

This member of the eucalyptus family is an attractive, hardy tropical. It was once known as Eugenia simpsonii. It can be a large shrub or small tree and can reach a height of 20 feet with a 15-foot spread. The tiny, deep green leaves contain aromatic oils with the fragrance of nutmeg. They grow densely, when in full sun, on the smooth-barked branches. When this plant is grown in shade, the foliage becomes less dense, and the trunk displays its attractive, smooth, exfoliating bark. Twinberry has fragrant, white flowers that grow in long panicles which occur periodically throughout the year. These flowers then develop into attractive, red berries that are edible. The flowers attract many species of butterflies, and the fruits are appealing to birds, especially the state bird of Florida, the mockingbird.

Twinberry grows well with minimal irrigation after establishment. It is widely used in roadway medians, along highways or in parking lots. It can be trimmed into a nice, multi-trunked small tree for use near a deck or patio to provide shade to a small area. This configuration shows off the bark nicely.

Twinberry can grow in full sun or deep shade and is most useful where the soils contain shell, marl, or lime rock (alkaline soils). This plant will tolerate wet soils but is also drought tolerant. It shears well, has a high salt tolerance, and is hardy to about 25°F. Its native habitat in Florida is the coastal upland forests with sandy soil containing shells and a neutral to slightly alkaline pH. Find out more about this species here.


Myrciaria cauliflora (jaboticaba, Brazilian grape tree, Brazilian grape)

Myrciaria cauliflora - Florida Section F LARE Landscape Architect Exam study guide
Myrciaria cauliflora

Native to Brazil, jaboticaba is an unusual tree that produces a purple, grape-like berry directly upon the trunk and larger branches either singly or in clusters. Under the skin is a whitish pulp with 1 to 4 seeds. The fruit has a pleasant flavor and taste a bit like grape. They can be eaten fresh or made into jam, jellies or wine. Flowering and fruiting occur periodically throughout the year so multiple crops are produced. Other than its fruit, jaboticaba is known for its beautiful multicolored bark, which gives it value in the landscape. The tree is small, slow growing, and bushy, and seldom exceeds 20 feet in Florida. Flowers are small and white, interesting but rather inconspicuous and borne right on the trunk and larger branches. Jaboticaba is relatively hardy but will not tolerate drought. Plant in full sun in a moist but fairly well drained soil. The tree prefers a slightly acid soil, so some special attention will be required to provide the proper nutrition on our alkaline soils. If provided with an ideal growing environment, jaboticaba can be a relatively low maintenance tree requiring little pruning or spraying for pests. Season: variable. Read more about tropical fruit trees suitable for South Florida here.


Myrica cerifera and cvs. (wax myrtle)

Myrica cerifera - Florida Section F Landscape Architect Exam study guide
Myrica cerifera

Multiple, twisted trunks with smooth, light grey bark, aromatic, olive green leaves, and clusters of grey-blue, waxy berries on female plants which are attractive to wildlife are just some of the reasons southern waxmyrtle is such a popular landscape plant. Most specimens form a multi-stemmed, open, rounded canopy of weak trunks and branches. This rapidly-growing, small, evergreen native tree is capable of reaching a height of 25 feet with an equal spread but is usually seen in the 10 to 20-foot range. Sometimes used as a large shrubbery screen, southern waxmyrtle is ideal for use as a small tree, the lower limbs removed to reveal its picturesque form. One, or several clustered together, provide pleasing dappled shade for terraces or patios.

Very tough and easily-grown, southern waxmyrtle can tolerate a variety of landscape settings from full sun to partial shade, wet swamplands or high, dry and alkaline areas. Growth is thin in total shade. It is also very salt-tolerant (soil and aerosol), making it suitable for seaside applications. It is adapted to parking lot and street tree planting, especially beneath powerlines, but branches tend to droop toward the ground, possibly hindering flow of vehicular traffic if not properly trained and pruned. Set them back from the road if used as a street tree so drooping branches will not hinder traffic. Removing excess shoot growth two times each year eliminates the tall, lanky branches and reduces the tendency for branches to droop. Some landscape managers hedge the crown into a multi-stemmed dome-shaped topiary. Plants spaced 10 feet apart, maintained in this manner, can create a nice canopy of shade for pedestrian traffic.

Plants should be watered well until established and will then require no further care. The only drawback to the plant is its tendency to sprout from the roots. This can be a nuisance as they need to be removed several times each year to keep the tree looking sharp. However, in a naturalized garden this thick growth could be an advantage, since it would provide good nesting cover for wildlife. Only female trees produce fruit provided there is a male nearby, but seeds do not appear to become a weed problem in the landscape. Read more about wax myrtles here.


Parkinsonia aculeata (Jerusalem thorn, Mexican palo verde)

Parkinsonia aculeata - Florida Section F Landscape Architect Exam Study Guide
Parkinsonia aculeata. Photo by Stan Shebs.

Loose, flowing, delicate leaflets, a light, airy, low-branching growth habit with pendulous branch-tips, and a profusion of small, slightly fragrant, yellow blooms combine to create this popular, small landscape tree. Quickly reaching a height of 20 to 25 feet with a similar spread, this multitrunked deciduous tree is actually much stronger than its fragile appearance would suggest. Branch bark often remains bright green even on several-year-old limbs.

Open-grown trees are beautiful if left unpruned, forming a fountain of fine texture. The stems are armed with short, sharp spines and the trees should be located where they will not injure passersby.

Thriving in full sun on any well-drained soil, Jerusalem-Thorn will tolerate heat, drought, alkaline soil, and salt but not wet, soggy soil. It will grow in clay only if it drains very well. In spite of its rapid growth rate, it has strong wood, withstanding harsh winds with ease due to the open growth habit. However, the trees have a short life, approximately 15 to 20 years. Poor drainage may account for short life on many sites, so locate it accordingly in areas where soil is never wet for more than an hour or two. The bark is thin and easily injured and the tree appears to compartmentalize decay poorly. Locate the tree properly and design the site to minimize trunk injury.

Adapted to arid regions, Jerusalem-Thorn is one of the best choices for hot, dry locations and its salt-tolerance makes it ideal for seaside plantings. The light shade afforded by the fine-textured foliage allows lawns to thrive beneath this tree and its small size allows a multitude of applications, from specimen, parking lot, median, or street tree, set back from the road or walk. Read more about this interesting small tree here.


Persea americana (avocado)

Persea americana - Florida Section F Landscape Architect Exam Study Guide
Persea americana

Perhaps one of the best known subtropical fruits, avocado trees are typically medium to large in size (40-60 feet), easy to grow and can produce large quantities of fruit. Limbs are vulnerable to wind damage and can even break under the weight of a heavy fruit load. The fruit is a very large berry consisting of a single large seed surrounded by a buttery pulp. Mature fruit are generally green, although some cultivars may be black, red or purple when soft (ripe). Avocados do not ripen until they are picked or fall to the ground. Mature fruit size varies considerably depending upon cultivar and growing conditions. Avocados are highly nutritious. Fruit are popular eaten fresh, in salads or used to make guacamole and other dishes. Planting in a well-drained site is a must, as avocados do not tolerate flooding. Productivity, season of maturity, cold tolerance, and disease tolerance vary greatly depending upon the variety under consideration. Season: late May to March. Read more about tropical fruit trees suitable for South Florida here.

 


Persea borbonia (red bay)

Persea borbonia - Florida Section F Landscape Architect Exam study guide
Persea borbonia

This handsome North American native evergreen tree can reach 50 feet in height with a comparable spread but is often seen somewhat shorter and wider, particularly when grown in the open in an urban area. The glossy, leathery, medium green, six-inch leaves emit a spicy fragrance when crushed and the inconspicuous, springtime flower clusters are followed by small, dark blue fruits which ripen in fall. These fruits are enjoyed by birds and squirrels and add to the tree’s overall attractiveness. The trunk bears very showy, ridged, red-brown bark and frequently branches low to the ground forming a multi-stemmed habit similar to live oak, but it can be pruned to make a single, short central leader which would be most suitable for many urban plantings.

Thriving on little care in full sun or partial shade, Redbay can tolerate a wide range of soils, from hot and dry to wet and swampy. Redbay is a rugged and adaptable plant suitable to many landscape applications. Unfortunately, the wood is reportedly brittle and subject to wind damage. Pruning to keep lateral branches less than half the diameter of the trunk will increase the tree’s longevity and help prevent branches from separating from the trunk. The densely-foliated, spreading branches create a lush, billowly, rounded canopy making Redbay a wonderful shade tree. It can make a nice street tree planted on 20 to 25-foot centers but be sure to prune it properly as mentioned above. Plant with caution where cars will park or near sidewalks since birds love the fruit and often visit the tree, leaving their droppings on cars. The fruit can also be messy on cars and walks. Its ease of growth and neat, dense crown habit also make Redbay ideal for the low-maintenance and naturalized landscape. The dark brown, furrowed bark is particularly attractive on older specimens. Find out more about red bay here.


Persea palustris (swamp bay)

Persea palustris - Florida Section F Landscape architect exam study guide
Persea palustris

The taxonomy of this native evergreen tree has been somewhat controversial. Some lump swamp bay together with its close relative red bay (Persea borbonia), due to their similar appearance. However, the two species are easily distinguishable from one another and are treated as such in Florida. Swamp bay is found in hydric areas, such as swamps, wet flatwoods, and on the edges of canals and marshes, whereas red bay frequents mesic sites. The native range of swamp bay extends from Virginia south throughout peninsula Florida and west to Texas. It can grow up to 40 feet tall in partial shade or full sun. Leaves are simple and alternate and grow from 2 to 8 inches long. They are lanceolate or a slightly more elongated elliptical shape and have smooth or entire margins. The topside of the leaf is dark green and shiny, while the bottom side is a silvery white color with an orange tinge from pubescence that occurs primarily along the mid vein; distinguishing it from red bay, which lacks this rusty color and concentrated pubescence. Leaves have a distinct bay aroma when crushed. The bark ranges from red to grayish-brown and flower blooms are white and inconspicuous. Fruits are dark blue to black, 3/8 to 5/8 inch drupes, and appear on hairy reddish stalks in the summer. Read more about swamp bay here.


Pinus elliottii var. densa (southern slash pine)

Pinus elliottii var. densa - Florida Section F Landscape Architect Exam Study Guide
Pinus elliottii var. densa

Slash Pine is self-pruning of its lower branches, is somewhat pyramidal when young and forms an open, rounded canopy creating a light, dappled shade beneath. This allows just enough sun to filter through for maintenance of a lawn beneath this tall, evergreen tree or for underplantings of dogwoods, azaleas, camellias and other plants which thrive in this high, shifting shade. Aggressive root competition takes place beneath Pines so the shrubs and lawn beneath and around the canopy often require more frequent irrigation, particularly during the dry season. Pines have some deep roots except in poorly-drained soil where all roots are shallow. The tap root is prominent in well drained soil and can make them difficult to transplant from the wild.

Slash Pine grows well on a variety of acidic soils in full sun or partial shade. It does poorly in basic soil (high pH) and so is not recommended for soils with high pH, or where irrigation water has a high pH. Once established, it is more tolerant of wet sites than most other Pines and is moderately salt-tolerant. It is not highly drought-tolerant but more so than most other Pines. The horizontal branches break easily in ice storms. Trunks which break in hurricanes break several feet up from the ground. Since shaded lower branches die and drop as the tree grows taller be careful not to plant them too close to high traffic areas where branches could fall on people or vehicles, unless there is a regular maintenance plan to remove them. Open-grown trees keep more lower branches, probably due to greater sun exposure.

Pinus elliottii var.  densa , the famous “Dade County Pine” of hardwood fame, extends from the Florida Keys up into central Florida. Development continues to remove these but nurseries are growing it to be replanted in the landscape in USDA hardiness zones 9, 10, and 11. It grows slower than the species, reaching about 40 feet tall with a rounded crown in 30-years. It could make a wonderful street tree, if set back from the roadway. Read more about slash pine in this article.


Plumeria rubra (frangipani)

Plumeria rubra - Florida Section F LARE Landscape Architect Exam study guide
Plumeria rubra

Frangipani is well-known for its intensely fragrant, lovely, spiral-shaped, reddish blooms which appear at branch tips June through November. The tree itself is rather unusual in appearance; the 12 to 20-inch-long, coarse, deciduous leaves cluster only at the tips of the rough, blunt, sausage-like, thick, grey-green branches. Branches are upright and rather crowded on the trunk forming a vase or umbrella shape with age. They are rather soft and brittle and can break but are usually sturdy unless they are mechanically hit or disturbed. The crown loses its leaves for a short time during the winter displaying the coarse-textured, stubby branches. A milky sap is exuded from the branches when they are bruised or punctured.

Frangipani is very susceptible to freezing temperatures and should be adequately protected or planted only in areas which do not freeze in the winter. Plants will grow quickly in full sun on a variety of well-drained soils and is fairly drought and salt tolerant. Reaching a height of 20 to 25 feet with an equal spread, Frangipani works well as a freestanding specimen, a patio tree, or as part of a shrubbery border. It displays well in a front yard as an attention-grabber by the entrance. It can be grown with a single trunk or branched low to the ground into a multi-trunked specimen. Single-trunk specimens could be planted as median or street trees on 15 to 20-foot-centers.

While Plumeria rubra produces red-toned flowers, other species offer a variety of colors. Plumeria alba has white flowers. Plumeria obtusa has white blooms centered in yellow and is variable in form and color. There are other species and cultivars.


Podocarpus gracilior (weeping fern pine, weeping podocarpus, weeping yew)

Podocarpus gracilior - Florida Section F Landscape Architect Exam Study Guide
Podocarpus gracilior

This 30 to 50-foot evergreen has a soft, graceful, billowy appearance of bright green new growth, dark green mature leaves, and weeping branch tips. If left unpruned the lower branch tips will touch the ground and the tree will appear as a stack of foliage emerging from the earth. With lower limbs removed a rounded vase shape or oval emerges creating dense shade beneath. Often used as an espalier, Fern Podocarpus is quite striking when used as a specimen, shade tree, or screening plant. It can make a beautiful street or parking lot tree but lower branches need to be removed with time as the tree grows since they tend to droop and could hinder traffic visibility. But this is a small price to pay for this wonderful tree. This is a tough plant which can grow very well in urban conditions. The trunk will slowly grow to be two feet in diameter or larger. Very adapted to downtown, restricted-soil planting sites, the roots rarely lift sidewalks or cause other problems.

Used as a large patio tree, the fine-textured foliage is sure to draw a complimentary remark from visitors and friends. Almost appearing like a large, soft, green cloud, Fern Podocarpus creates a beautiful effect when placed beside a pond or other water interest. The tree combines well with Yellow Lantana or other low-growing yellow flowering ground covers planted under the tree. It compliments glass-sided structures well, its soft foliage shimmering and reflecting on a breezy, sunny day.

Growing in full sun or partial shade, it will tolerate a wide range of well-drained soils and should be protected from frost. In Florida, it is considerably tolerant of dry soils requiring no irrigation once established. Read more about this nice tree here.


 

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