Smooth Sumac (Rhus glabra) - How to Grow & Care Guide

Plant Snapshot

Common Name: Smooth Sumac
Latin Name: Rhus glabra
Hardiness Zones: USDA zones 3–8. In colder zones plants may experience winter dieback to the crown. In warmer zones growth can be more vigorous and spread by suckers.
Typical Height: 6–15 ft (1.8–4.6 m).
Typical Spread: 8–20 ft (2.5–6 m) by suckering habit.
Bloom Period: Late spring to early summer for flowers. Red fruit develop late summer into fall.
Soil Preferences: Prefers well drained soils. Tolerates poor dry, rocky and alkaline soils. Poor drainage can lead to decline.
Light Preferences: Full sun to light shade. Best flowering, fruit set and fall color in full sun.
Toxicity: Not the poison sumac. Fruit historically used as a tart flavoring. Large ingestions may cause stomach upset and sap can irritate sensitive skin. Check poison control for pet specifics.
Propagation: By seed with cold stratification, by root suckers and by hardwood cuttings.

Key Facts

Deciduous shrub or small tree with pinnate leaves.
Native to much of central and eastern North America.
Produces dense colonies by root suckers.
Clusters of small yellowish flowers appear before red fruit clusters.
Bright red fruit clusters persist into fall and attract birds.
Tolerant of poor dry soils and often used for erosion control.
Prefers full sun for best flowering and fall color.
Not the poison sumac species but handling may irritate sensitive skin.

Smooth Sumac is a native North American deciduous shrub or small tree valued for its upright habit, pinnate leaves and persistent red fruit clusters. It forms colonies by root suckers so it works well for erosion control and naturalized screens, though containment is necessary near foundations or formal beds.

Identification

Smooth Sumac has pinnate leaves and produces clusters of small yellowish flowers in late spring to early summer followed by bright red fruit clusters that persist into fall. Mature plants typically reach 6 to 15 feet tall and commonly spread 8 to 20 feet by suckering, forming dense colonies when left unmanaged.

Where to grow and best uses

This species thrives in full sun and tolerates poor, dry, rocky and alkaline soils, making it a good choice for erosion control slopes, wildlife edges and naturalized hedgerows. It attracts birds with its red fruit, but its suckering habit makes it a better fit for informal sites than tightly planted ornamental beds.

Planting and spacing

Space plants to allow for a mature spread of roughly 8 to 20 feet so suckers have room without crowding foundations or ornamentals. Plant in well drained soil; poor drainage can lead to decline. In USDA zones 3 to 8 plants are hardy, with winter dieback possible to the crown in the coldest sites and more vigorous spread in warmer areas.

Soil, light and watering

Plant in well drained soil and give full sun for best flowering and fall color; light shade is tolerated but fruiting and color may be reduced. Smooth Sumac tolerates dry conditions once established. Avoid heavy wet soils because standing moisture can weaken plants and increase susceptibility to root problems.

After‑flowering care and pruning

Fruit clusters persist into fall and provide food for birds, so retain some fruit for wildlife if desired. Control habit by removing unwanted suckers and cutting back shoots to shape the colony. Remove dead wood and thin congested growth to maintain health and form, keeping in mind that root suckering will renew colonies over time.

Controlling spread and propagation

Smooth Sumac spreads by root suckers and can form dense colonies; install root barriers or remove suckers regularly to prevent unwanted spread near structures. Propagate from seed with cold stratification, by transplanting clonal suckers or by hardwood cuttings. Suckers produce genetically identical plants and should be used cautiously where containment is needed.

Frequently asked questions

How fast does Smooth Sumac grow?: Growth is moderate to fast depending on site and soil. Plants commonly reach the typical mature height of 6 to 15 feet over several years, with spread increased by root suckering.
Is Smooth Sumac poisonous?: It is not the poison sumac species. Sap can irritate sensitive skin and large ingestions may cause stomach upset. Consult poison control or a veterinarian for pet or human ingestion questions.
Will it take over my yard?: It can naturalize by root suckers and form colonies. Regular removal of suckers or a root barrier will limit spread and keep plants where you want them.
Can I eat the berries?: Fruits have been used historically as a tart flavoring and birds eat them. Confirm safety with a trusted toxicology or extension source before consuming any wild fruit.
How do I propagate Smooth Sumac?: Propagate by seed with cold stratification, by transplanting root suckers or by hardwood cuttings. Suckers give quick clones but require containment when planted near landscaping.