Archive for the ‘Trees & Shrubs’ Category

Avoiding Crape Myrtle Hardiness Problems

Late summer (September 1st) is your deadline to plant crape myrtles (Lagerstroemia spp.) in USDA hardiness zone 6. Your primary objective should be to grow deep plant roots. Crape myrtles are classified as perennials in northerly areas of zone 6. In many years their woody branches die back after a cruel cold winter. The hardy […]

Exclamation™ London Plane Tree Is A Game-Changer

Exclamation! London Plane Tree (Platanus x acerifolia Exclamation!™) is probably one the most improved cultivars to date (USDA hardiness zones 4-8). Exclamation! was introduced by Dr. George Ware at the Morton Arboretum and released through the Chicagoland Grows® program. Exclamation! develops a strong central leader, a uniform upright pyramidal shape (when young), a vigorous growth […]

Plumleaf Azalea – Late July Flowering Shrub

Plumleaf azalea (Rhododendron prunifolium) is a native deciduous azaleas that indigenous to the Chattahoochee River Valley on the Georgia-Alabama line (USDA hardiness zones 6-9). The bright orange-red blooms surprise in late July to early August. Compared to many of the spring blooming species, flowers are not fragrant. Fall leaf color is uneventful. This 5-8 feet […]

Crape Myrtle Diseases And Pests

Not all crape myrtle cultivars are alike. Some are more susceptible to diseases and insect pests more than others. Overall, the U.S. National Arboretum (USNA) hybrid crapemyrtles are more disease and insect resistant, but not to all problems. Some cultivars are susceptible to aphids, usually in the spring. Their sugary excretions over leaves and stems […]

Disease Resistant Crape Myrtle Cultivars

‘Apalachee’ crape myrtle trunk Hybrid crape myrtles (Lagerstroemia indica x L. faurei) are popular landscape trees in the southeast and along the coastal areas of the U. S. Over the past decade plant pathologists in Louisiana (Louisiana State University), Alabama (Auburn University), South Carolina (Clemson University), and Georgia (University of Georgia) have tested the disease […]

Designing With Crape Myrtle

Undeniably, crape myrtles (Lagerstroemia indica x L. faurei ) thrive in the southern U.S. (USDA hardiness zones 6-9). You see them planted on practically every street. Their showy summer flowers are spectacular. Many cultivars exhibit colorful autumn foliage, and their smooth patterned trunks and architecture grace the winter landscape. “The right crape myrtle for the […]

Mimosa Tree- Love It or Weed It

Mimosa (Albizia julibrissin) is essentially a 4-5 month ornamental tree indigenous from Iran to China (USDA hardiness zones 6-9). From late spring through summer, mimosa struts an attractive fine textured foliage and beautiful flowering. This small tree rarely leafs out until mid-May (in zone 6) and offers little in autumnal leaf color. Two seedling forms, […]

Caveats Before Planting Planetrees (Sycamores)

American sycamore, aka planetree, (Platanus occidentalis) is a native tree planted over a large area of the United States (USDA hardiness zones 4-9). Its enormous size, often 70-90 feet in height, limits it to planting mostly on large landscapes such as parks, golf courses, and industrial parks. Northern U.S. cities have planted it extensively along […]

Japanese Pagoda Tree Becoming Popular In U.S. Cities

U.S. east coast cities are finally planting Japanese Pagodatree (Styphnolobium japonicum). This medium-sized tree grows to 50 feet high, but 75 feet is not uncommon in the southeastern U.S. Pagodatree is native to eastern Asia (USDA hardiness zones 4 –8) where it is more known as Scholar tree. In the early 20th century it was […]

Lovely Tall Stewartia Deserves Your Attention

Not enough gardeners know about stewartias (Stewartia spp.). Six species are found under cultivation, 2 native to the U.S. and 4 of Asian origin. One of the rarest seen in U.S. gardens is tall stewartia (S. monadelpha) (USDA hardiness zones 5-8). Tall stewartia is a more site forgiving than Japanese stewartia (S. pseudocamellia), the most […]