Archive for the ‘Chlorosis (yellowing)’ Category

MT. Cuba Evaluates BlueStars (Amsonia)

MT. Cuba Center is located near Hockessin Delaware, near Wilmington (USDA hardiness zone 7a.). It has recently published a new trial report on bluestars (Amsonia spp.) for the mid-Atlantic region. BlueStars are a genus of popular, long-lived herbaceous perennials. Most are native to the U.S. and Mexico in addition to one Asian species (A. elliptica) […]

Sweetbay Magnolia Cultivars

Sweetbay magnolia (Magnolia virginiana) is a U.S. native tree that is finally catching on with landscape designers. Sweetbay often grows 20-30 feet tall and 15-20 feet wide as a large shrub or multi-stemmed small tree. Discovering a 50-60 feet sweetbay near by a lake or pond is not unusual to find (USDA hardiness zones 5-9). […]

Wonderful Carolina Silverbells

To start, the botanical literature is a little confusing regarding the two silverbell species. Mountain silverbell (Halesia tetraptera; formerly H. carolina) and two-winged silverbell (H. diptera) are native to the Appalachian Mountains of Tennessee, North Carolina and Georgia. (Zones 6-9). Silverbells are either small- to medium-sized deciduous trees or large, multi-stemmed shrubs. It blooms in the spring (late-March […]

January Blooming Vernal Witchhazel

This winter – follow your nose to Vernal witchhazel (Hamamelis vernalis), aka Ozark witchhazel. (USDA zones 4-8). This U.S. native witchhazel grows as a deciduous shrub to small tree. It may produce the smallest flowers of all witchhazel species, but they’re highly fragrant when little else is blooming. It naturally inhabits a wide area encompassing […]

All About Flowering Quinces

Flowering Quince (Chaenomeles speciosa) is a deciduous shrub in the Rose (Rosaceae) family and related to apple and pear (Zones 5-9). It is native to China and is relatively easy to grow. Plant quince in moist, well-drained soil; it flowers best in full sun but is moderately shade tolerant. Feed quince shrubs annually in early […]

Why My Tree Turns Yellow in Summer

Leaves of some landscape trees turn yellowish- green color in the summer. The common cause for this malady is a lack of minor nutrients (“micronutrients”) that are essential for plant growth. These nutrients are available in the soil in very small quantities. Nutrient deficiencies are not common, except in the high pH soils, particularly the […]

Roof Iris in Springtime

Roof iris (Iris tectorum) is indigenous to China. This beardless iris is part of the crested iris group. Leaves stand 15 inches tall, fanned at the base and are ribbed.  The clean green fan-like leaves remain mostly blemish-free most of the growing season. Plants give rise to purple-blue flowers with white and darker purple flecks starting […]

Five Redbuds With Dynamite Seasonal Foliage

Here are five notable redbuds (Cercis canadensis) possessing colorful summer foliage. Of note, the first 3 of 5 varieties are the creation of noted plant breeder Dr. Dennis Werner of NC State University in Raleigh. Flame Thrower® has stunning eye-catching foliage color breakthrough in the world of redbuds. It is marketed as Eternal Flame® in Europe. […]

Bald Cypress For A Small Landscape

Bald Cypress (Taxodium distichum) is well-known as a deciduous conifer native to the southeastern U.S. (USDA hardiness zones 5-9). Pyramidal in form, bald cypress towers over 70 feet tall with a spread up to 50 feet. Bald cypress is naturally found in southeast U.S. swamps, marshlands, lakes, ponds, and other wetlands. On marshy ground, you […]

Lots of Choice With European Hornbeams

European hornbeam (Carpinus betulus), aka ironwood and musclewood, is an underused tree that is an excellent urban street and park tree. (USDA hardiness zones 4-7). The tree develops a full, dense canopy and little maintenance requirements.  The species typically grows 40-60 feet (less frequently to 80 feet) tall with a pyramidal to oval-rounded crown. Its dense […]