vineN. America Native

Bristly Greenbrier

Smilax tamnoides

The Story

Plant Bio

Smilax tamnoides, the bristly greenbrier, is a deciduous woody vine native to North America that climbs up to forty-five feet using paired tendrils at the leaf bases. The stems are heavily armed with stiff, needle-like, dark brown to blackish prickles that are particularly dense on the lower and older wood.

This species is distinguished by its lustrous, bright green, ovate leaves and its dioecious habit, producing small green to yellow-green flowers in drooping umbels. In fall, female plants produce dark berries that serve as a critical winter food source for songbirds and game birds.

Uses & Benefits:

Lustrous bright green foliage and dark winter stems provide structural interest in naturalistic designs.

Forms an impenetrable barrier or hedge to direct foot traffic away from sensitive areas.

Provides dense nesting cover for birds and a vital winter food source of berries for native wildlife.

Essentials

At a Glance

Plant Type

Vine

Height

360"

Width

180"

Light

Full Sun, Partial Sun, Shade

Zones

4, 5, 6, 7, 8, 9

Water

Moderate

Humidity

High

Lifespan

Perennial

Native To

North America

Toxicity

Non-toxic

Bloom period

Spring – Summer

In flower about 6 months of the year

Planting

How to Grow

Select a planting site in full sun to dappled shade with moist, organic-rich soil.
Dig a hole twice the width of the root ball and set the plant at its original container depth.
Provide a sturdy trellis, fence, or allow it to scramble naturally over woodland edges.
Water deeply during the first growing season to establish a deep, resilient root system.

Pro Tip

To eradicate or control unwanted specimens, dig out the entire woody root crown; surface mowing merely stimulates vigorous root sprouting and results in a denser thicket.

Keep It Thriving

Care Guide

Do

Wear heavy leather gloves and protective clothing when handling or pruning the bristly stems.
Mulch the root zone annually with organic compost to maintain moisture and soil structure.

Don't

Do not shear the vine repeatedly into old, leafless wood, as this produces patchy, weak regrowth.
Avoid planting near high-traffic walkways or garden borders where the sharp prickles can snag skin.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Mulch
Pest Check
Propagate
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Wildlife gardensWoodland edge plantingsNaturalized barriersErosion control on slopes

Companion Plants

Parthenocissus quinquefolia Clematis virginiana Sambucus canadensis

Multiply

Propagation Methods

Good to Know

Common Questions

Bristly Greenbrier questions

What zones can Bristly Greenbrier grow in?

Bristly Greenbrier is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Bristly Greenbrier deer resistant?

Not reliably. Deer may browse Bristly Greenbrier, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Bristly Greenbrier bloom?

Bristly Greenbrier typically blooms in spring through summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Bristly Greenbrier need full sun?

Bristly Greenbrier does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Bristly Greenbrier drought tolerant?

Yes — once established (usually after the first full season), Bristly Greenbrier handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.