Archive for July, 2010

Thousand Cankers Disease Found in Knoxville, TN

Photo: walnut canker from Dr. Alan Windham, Extension Plant Pathologist, University of Tennessee A black walnut (Juglans nigra) sample collected by Dr. Scott Schlarbaum, research forester at the University of Tennessee, has been confirmed as thousand cankers disease (TCD) (Geosmithia sp. nov.). Also found in the Knoxville TN walnut sample was one adult male beetle, […]

Pennisetum ‘Karley Rose’

Asian fountain grass cultivar ‘Karley Rose'(Pennisetum orientale) is a four season eye-catcher. It is reliably hardy in USDA zones 5-9. It produces smoky rose colored flower spikes (plumes) in early summer, which persist thru the winter months. Its dark green foliage begins upright in form, 2 1/2 feet tall, achieving 3 feet in height in […]

‘Buttered Popcorn’ Daylily- Performs In The Mid-South

Daylily ‘Buttered Popcorn’ (Hemerocallis ‘Buttered Popcorn’) produces buttery yellow 6″ flowers from late June thru mid-July. The 32-inch tall floral scapes are well branched and flowers are mildly fragrant. Bud count on each scape may average 10 or more. This tetraploid cultivar is also well known for its incredible fall re-bloom. In the Southern Appalachian […]

‘Diabolo’ Ninebark as Small Patio Tree

photo: ‘Diabolo’ ninebark trained as a small tree I saw this idea several years ago at an Ohio nursery. Common ninebark (Physocarpus opulifolius) is basically a utility shrub, inexpensive to purchase in large quantities. This midwest native grows in almost any soil or landscape environ except shade and bog areas. Over the past decade ninebark […]

Windmill Palm

Photo by Dr. Tim McDowell, East TN State University Botanist of an 8 year old windmill palm (now deceased)Windmill Palm (Trachycarpus fortunei) is not reliably hardy in the Southern Appalachian region (zones 6-7), even when planted in an outdoor protected area. An alternative is to grow in a container for ease of moving it indoors […]

Japanese Maple Selections for Mid-South

Photo: ‘Sango Kaku’ coral bark maple in November Japanese maple (A. palmatum) offers a vast array of shrub and tree forms of varying heights and leaf shapes. Spring and summer leaves vary from gold, to dark green, to deep red and some color variegation and either cutleaf or dissected forms. The dissected leaf forms of […]

Growing Hardy Banana

Hardy banana (Musa basjoo) survives winters as far north as New England and Ontario, Canada (USDA Zones 5-10). It is a herbaceous perennial which grows to 6-14′ tall. Its roots, when heavily mulched, survive winter temperatures of -10 degrees F. Grow hardy banana in compost rich, well-drained soil in full sun to partial shade. Feed […]

Coreopsis ‘Route 66’ – A Riot of Color

 Create a hot splash in your garden this summer. Threadleaf coreopsis (Coreopsis verticillata) ‘Route 66’ is a new selection by Itsaul Nursery in Atlanta, Georgia (USDA zone 4 to 9). Coreopsis ‘Route 66’ originated in Pennsylvania (zone 5). Perennial gardeners have been planting yellow- flowered ‘Moonbeam’ and ‘Zagreb’ cultivars for over a quarter of a […]

"pH Nutrient Creep? -You Nailed It"

Photo: Foliar iron deficiency on river birchRiver birch (Betula nigra) is a popular landscape tree in the Southern Appalachian region (USDA zones 6-7). The cultivars ‘Heritage’ and ‘Duraheat’ have made a good native species even better with resistance to aphid and leafhopper insects. However, river birch demands a soil pH which is moderately acid. Why? […]