shrubs

Virus Diseases on Broadleaved Shrubs

Return to Common Problems of Shrubs Virus symptoms often include color changes in the leaves such as a mosaic or mottled pattern of light and dark green. Other color changes could appear as ring patterns of light green or necrotic or bleached areas. Additional symptoms include stunted or malformed...

Rust on Broadleaved Shrubs

Deciduous azaleas are the primary group of broadleaved shrubs damaged by rust. Of the six rusts in North America, the hemlock-blueberry rust, Puccininastrum vaccinii, is the most common rust infecting deciduous azaleas in Maryland.

March Tree and Shrub Tips

(More tips from HGIC) For a bright vase of color indoors, the prunings of spring flowering shrubs can be brought in and placed in water to force early blooms. Forsythia, pussy willow and some blooming ornamental fruit trees work well for this. Non-flowering trees and shrubs can be pruned before new...

February Tree and Shrub Tips

Desication or winter burn often occurs in February. Photo: Minnesota DNR, bugwood.org (More tips from HGIC) February is the month when most ‘winter burn” (brown needles or leaves) occurs. Winter burn (desiccation) results from a combination of cold drying wind, fluctuating temperatures from very...

December Tree and Shrub Tips

Norway spruce. Photo: Robert Videki, Univ. of GA, Bugwood.org (More tips from HGIC) In a “normal” year in our region we do not get much ice or snow in December but if we do, try to prevent it from building up on gutters and eaves above shrubs. Heavy snow and ice loads can break branches. Using an...

October Tree and Shrub Tips

Powdery mildew on dogwood turns leaves purple. Photo: D. Clement, UME (More tips from HGIC) The dryness and heat of the summer had an effect on many trees in our area in landscapes and in the wild. Prolonged heat and drought will cause premature fall leaf drop with many tree species, and their...

September Tree & Shrub Tips

Photo: Fall folliage of a sweetgum tree. (More tips from HGIC) Poison ivy leaves will begin to turn red this month. Don’t be fooled by their color change, the leaves are still very irritating. Do not handle or shred the leaves and do not burn the vines. To control poison ivy, spray with a systemic...

Featured Plants - Clematis ‘Jackmanii’

Clematis x Jackmanii Varieties of clematis come and go, but Jackmanii is a timeless beauty found in gardens since 1862. The lush, velvety deep purple flowers fill the vine from June through August. Jackmanii (pronounced Jack-man-e-i) is a vigorous vine with few pest or disease problems and can...

Featured Plants - Swamp Azalea 'Delaware Blue'

Rhododendron viscosum ‘Delaware Blue’ When typical azaleas and rhododendrons finish blooming, our native azaleas begin. There are several species of these deciduous azaleas, and they come into flower at a time when shrub bloom is scarce. One of their best qualities is rich fragrance. Swamp azalea,...

June Tree and Shrub Tips

Black spot on roses. ( More tips from HGIC ) If you planted trees or shrubs this spring, be sure to keep them well watered through dry weather this summer. Thoroughly soak the root ball every few days. A 2-3 inch layer of mulch is helpful. Keep mulch away from the trunk or stem. Roses are...

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