Rhus glabra (Smooth Sumac)


Michael's Opinion

An unassuming, low growing, rapid ground-cover shrub. Dark green, clean foliage adds to its purpose through the season. A workhorse of a plant, but of limited ornamental value.

Botanical Information

FamilyAnacardiaceae
GenusRhus
Speciesglabra
CategoryWoody
TypeTree (deciduous)
ReferencesGenerally available in many areas within its hardiness zone.
OriginNative to North America.
Pronunciation

Details

USDA Hardiness Zone3 - 9
USDA Hardiness Ref.
Canadian Hardiness Zone3a-6b
Canada Hardiness Ref.
RHS Hardiness Ref.
Temperature (°C)-25 to -30
Temperature (°F)-15 to -30
Height3-5 m
Spread3-5 m
Flowering PeriodJune

Description and Growing Information

General DescriptionPinnate leaves and large red fruit, the foliage grows high on the plant forming a 'canopy'.
ID CharacteristicStout thick herbaceous stems, tomentose shoots, pinnate leaves on the top 1/3 of the plant. It has distinctive red berries forming a panicle at the apical meristems which remain throughout the winter.
ShapeRound suckering shrub which will continue to spread forming large colonies.
LandscapeGood for massing, screening and has good winter form.
PropagationMost commonly propagated by root division. Acid scarify seeds for 2 hours then stratify them for 30 days at 5°C before sowing them 1-2 cm deep.
CultivationPrefers well drained acidic soils, it will tolerate very dry soil conditions, and thrives in full sun.
PestsMay suffer from verticillium wilt, powdery mildew, leaf spot, scale insects, aphids and caterpillar infestations.
Notable SpecimensAmerican national co-champions are 8.5 x and 38.2 x 5.8 m in Walla Walla, Washington State, United States of America
HabitatNative to forest edges and meadows across the U.S and from Quebec to southern British Columbia.
Bark/Stem DescriptionFairly smooth greyish-brown bark. The younger shoots are herbaceous; they are purple and green with a slight pubescence.
Flower/Leaf Bud DescriptionPubescent, round, ovoid, leaf scar almost completely encircling bud. The bud is .5 cm and hugs closely to the shoot.
Leaf DescriptionLanceolate serrate leaves in alternate pinnate form, 11-31 leaflets 5-15 cm in length and 1-3 cm wide, medium-dark green leaves turning yellow, orange, red and purple in the autumn.
Flower DescriptionAn inflorescence of tiny greenish-white flowers on 15-25 cm panicles.
Fruit DescriptionSmall edible crimson berries with short hairs that form a panicle at the shoot apical merstem, these remain throughout the winter.
Colour DescriptionGreyish-brown bark, medium-dark leaves that turn yellow, orange, red, purple, greenish-white inflorescence, crimson red berries.
Texture DescriptionPubescent buds and young shoots, smooth bark and smooth leaf surface. Overall smooth pubescent texture.

Photographs