Archive for the ‘Disease resistant’ Category

How Drought Affects Our Landscape Trees*

Long term drought can be devastating on landscape and woodland trees. An environmentally stressed tree must expend additional energy to survive. Extremes of drought leads to decreases in trunk diameter and height growth, declining resistance to pests and diseases, less food production via photosynthesis, and in flower and fruit production. Symptoms of drought stress include wilted […]

Act Quickly Against Eastern Filbert Blight

European Hazelnut (Corylus avellana) is highly prized both for its edible nuts and as a landscape shrub/small tree. Unfortunately, it is susceptible to eastern filbert blight (EFB). American hazelnut (C. americana) is relatively resistant. EFB is a lethal disease as it may kill a large shrub in 4-5 years. The fungus was discovered in the Pacific […]

Chinese Fringetree Is Versatile Landscape Tree

Chinese fringetree (Chionanthus retusus) is native to China, Korea and Japan (Zone: 6 to 9a). Related to native U.S. species (C. virginicus), fringetrees are noted for their profuse spring bloom of fragrant white flowers. It is most often seen in cultivation as a large, multi-stemmed, deciduous shrub growing to 15 – 20 feet tall with a […]

U.S. Native Bleeding Hearts Dazzle In Woodland Garden

One of nature’s delights in the late spring  – early summer garden is the wonder of bleeding hearts (Dicentra spp.) in bloom (USDA hardiness zones 3-9). Fringed bleeding heart (D. exima) is a U.S. native to  the Appalachian Mountains. Fringed bleeding heart exhibits deeply-cut, fern-like, grayish-green foliage on 10-15 inch tall plants. Dangling bright pink pendant (or heart) flowers […]

Bigroot Geranium

Bigroot geranium (Geranium macrorrhizum), aka “cranesbill”, is a clump-forming perennial ground cover from Southern Europe (USDA Zones 3–8). It is one of the easiest geraniums to grow. Plants spread by thick rhizomes to form a dense ground cover. Individual plants grow 12 to 18 inches high and 18-24 inches spread. The 1-inch wide, 5-petaled dark […]

Korean Maple Substitute For Fullmoon Japanese Maple

At first sight Korean maple (Acer pseudosieboldianum), aka Korean fullmoon maple, is very similar in appearance to fullmoon Japanese maples (A. japonicum var. Acontifolium). If you live in a northern U.S. such as the upper Midwest, growing Japanese maples will likely become an unfulfilled wish. Korean maple is a hardier choice for northern locales (USDA hardiness zones 4-8). […]

Quest For The Perfect Tomato Continues

Improved disease resistance, fruit color, firmness, and flavor continues to be the main goals of tomato breeders around the U.S. Leaf and root diseases vary from one region to another across the country. Here in the eastern U.S.,  late blight resistance is of key interest. Over the past 33 years, Dr. Randy Gardner, tomato breeder extraordinaire in […]

ACS SOUTHEAST REGION CONIFER REFERENCE GARDENS*

I hear people say that conifers won’t grow in the southeastern U.S. Wanta bet! 2016 marks the 8th year of the Reference Garden program sponsored by the American Confer Society (ACS)- Southeast Region. From Kentucky and Virginia south to Florida, 19 public gardens were now participating in the program. Two of the latest additions are Brookgreen […]

Virginia Sweetspire — A Standout Native Shrub

Virginia sweetspire (Itea virginica) is a native shrub that touts showy white raceme flowers in late spring and brilliant reddish purple foliage in fall (USDA hardiness zones 5-9). Flowers are very fragrant and attracts hundreds of bees and other pollinators. VA sweetspire excels in moist, humus-rich, mildly acidic soils (pH 5.2-6.5). In its native habitat, […]

Sweet Potato Vines

Ornamental sweet potato vines (Ipomoea batatas) have been around since the late 1980’s, but their popularity have soared over the past decade. These sweet potatoes aren’t for the table. The colorful vines thrive in the intense heat of U.S. summers from May through September (zones 5-11). These easily grown plants work well as a low-growing bedding plant, […]