Bulletin #2578, Native Trees and Shrubs for Maine Landscapes: Smooth Sumac (Rhus glabra)
Developed by Marjorie Peronto, Associate Extension Professor, University of Maine Cooperative Extension; and Reeser C. Manley, Assistant Professor of Horticulture, University of Maine.
This series of publications is the result of a five-year research project that evaluated the adaptability of a variety of native trees and shrubs to the stresses of urban and residential landscapes in Maine. Non-native invasive plants pose a serious threat to Maine’s biodiversity. Plants such as Japanese barberry, shrubby honeysuckle, and Asiatic bittersweet, originally introduced for their ornamental features, have escaped from our landscapes, colonizing natural areas and displacing native plants and animals. By landscaping with native plants, we can create vegetation corridors that link fragmented wild areas, providing food and shelter for the native wildlife that is an integral part of our ecosystem. Your landscape choices can have an impact on the environment that goes far beyond your property lines.
Form: an irregular and open shrub with short, crooked, leaning trunks and leggy branches; forms large colonies
Size: 10 to 20 feet high and wide
- erect, pyramidal spikes of hairy, red berries
- scarlet red autumn foliage
In the wild, smooth sumac grows along sunny forest edges or in open fields, forming large colonies of either male or female plants. Although often found in pure stands, it may also be found growing with black cherry (Prunus serotina), hawthorns (Crataegus spp.), viburnums (Viburnum spp.), and beaked filbert (Corylus cornuta).
Think of smooth sumac as a smaller version of the closely related staghorn sumac (Rhus typhina). Difficult to manage in small garden spaces because of their colonizing habit, both are best used in naturalized settings, along the woodland edge or roadside, or in any location where frequent mowing or existing paving will control their spread. Avoid planting R. glabra in shady or wet areas.
The showy, pyramidal spikes of deep red fruits are borne only on female plants. Purchasing plants in fruit will ensure that this feature is a part of your landscape.
Hardiness: USDA zone 2
Soil requirements: tolerant of a wide variety of soils
Light requirements: full sun
soil compaction — intolerant
pollution — tolerant
deicing salts — tolerant
urban heat islands — tolerant
drought — tolerant
seasonal flooding — intolerant
Insect and disease problems: infrequent
Smooth sumac provides nectar for several butterflies, including banded and striped hairstreaks. Spring azure butterfly caterpillars feed on Rhus glabra foliage. The fruits persist into late winter and serve as emergency food for many species, including turkeys, bluebirds, robins, catbirds, rabbits, and deer. The tree also provides nesting and shelter for many bird species.
Irrigation: Water shrubs regularly for at least one year after planting. Apply 1 inch of water over the root zone once a week until leaves fall in autumn: in general, a shrub’s root zone extends twice as wide as its canopy. Once plants are established, further watering should not be necessary unless there are extended periods of drought.
Fertilization: Landscape trees and shrubs should not be fertilized unless a soil test indicates a need. Correct soil pH, if necessary, by amending the backfill soil. No nitrogen fertilizer should be added at planting or during the first growing season.
To learn more about native woody plants
Visit the Eastern Maine Native Plant Arboretum at University of Maine Cooperative Extension’s Penobscot County office, 307 Maine Avenue in Bangor. Established in 2004, the arboretum displays 24 different native tree and shrub species that can be used in managed landscapes.
Reviewed by Cathy Neal, Extension professor, University of New Hampshire Cooperative Extension.
Photos by Reeser C. Manley.
Illustration by Margery Read, Extension Master Gardener.
Information in this publication is provided purely for educational purposes. No responsibility is assumed for any problems associated with the use of products or services mentioned. No endorsement of products or companies is intended, nor is criticism of unnamed products or companies implied.
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