Archive for the ‘Trees & Shrubs’ Category

Less Invasive Butterfly Bush Identified

Butterfly bush (Buddleia) is a popular garden shrub in many areas of the U.S. Buddleia invasiveness is a serious issue in the Pacific Northwest. The Oregon Dept of Agriculture, Plant Division, has approved for sale these buddleia cultivars in the state. The approved varieties produce 2% or less viable seed, meeting Oregon’s standards for sterility. The […]

Panicle Hydrangeas For Small Gardens And Containers

Panicle, PeeGee or PG hydrangeas (Hydrangea panculata) brighten up your July-August garden. They hail from China and Japan and grow almost anywhere in the U.S. (USDA hardiness zones 3 – 8). PG hydrangeas are far more reliable in northern areas (zones 3-5), than mophead hydrangeas (H. macrophylla). They flower at their best in full to partial day sunlight (6 hours […]

Sorting Through The Joe Pye Cultivars

Joe Pye weed (Eutrichum purpureum) is a native perennial commonly spotted onthe edge of farm fields in the eastern and northern U.S. (USDA hardiness zones 4 to 9). The wild species grows 5-7 feet high and 2-4 feet wide. It blooms from late July to September and is a magnet to attract bees and butterflies. Over the past two […]

Fall In Love With Haas’ Halo® Hydrangea

Anyone walking through your garden will stop to see Haas Halo®) hydrangea (Hydrangea arborescens Haas Halo®).  This native smooth hydrangea has intense blue-green, leathery foliage and huge pure white wide lace cap blooms (USDA hardiness zones 3-9). Flowers stand tall on stout sturdy stems. Shrub branching is upright. This new hydrangea was found by Frederick H. Ray, […]

Spring – Summer Care of Herbaceous Peonies After Flowering

Summer weather can be tough on the foliage of tree and herbaceous peonies tree (P. lactiflora). Here are some tips to ensure your peony plants will prosper for many years to come. Keep foliage disease-free and prune off all badly infected with mildew or black spotted.  Some varieties naturally shed their leaves (go dormant) early. Itoh hybrids and most […]

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 […]

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). […]

Gardenias Continue To Disappoint In The Mid-South

The lure of fragrant white flowers have mid-South gardeners (zones 6 and 7) wanting to grow gardenias (Gardenia jasminoides). New cultivars, supposedly hardier than previous ones, hit garden centers every spring. Unfortunately, zones 6 and 7 winters usually prove them wrong. Recent purchases of new cultivars ‘Frostproof’ and Pinwheel® and older selection ‘Kleim’s Hardy’ have […]