vineN. America Native

Common Greenbrier

Smilax rotundifolia

The Story

Plant Bio

Smilax rotundifolia is a woody, scrambling native vine that climbs extensively via paired tendrils to form dense, impenetrable thickets. The green, four-angled stems are heavily armed with stiff, sharp prickles and carry glossy, alternate, rounded leaves.

This deciduous to semi-evergreen species produces small, greenish-yellow clusters of flowers in spring, followed on female plants by waxy, bluish-black berries that persist into winter. It spreads aggressively via a massive, deep-seated network of tuberous underground rhizomes.

Uses & Benefits:

Provides a dense, glossy green foliage cover over fences or rough ground, with waxy blue-black berries persisting into winter.

Forms an impenetrable, thorny barrier hedge that deters intruders and helps stabilize soil on slopes or coastal dunes.

Offers critical nesting cover for songbirds and small mammals, while the winter berries serve as an important food source for wild turkeys and grouse.

Essentials

At a Glance

Plant Type

Vine

Height

240"

Width

236"

Light

Full Sun, Partial Sun, Shade

Zones

4, 5, 6, 7, 8, 9

Water

Medium

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 site with ample room to spread, ideally along forest edges or wild areas where its aggressive growth will not threaten formal garden beds.
Plant container-grown specimens in well-drained soil ranging from full sun to full shade, watering regularly until the root system is established.
Provide a sturdy support structure or allow the vine to scramble naturally over rough ground and existing wild vegetation.
Wear thick, heavy-duty leather gloves whenever handling or training the stems to protect against the sharp, rigid prickles.

Pro Tip

Never cut back only the top growth of established plants, as this triggers rapid, vigorous resprouting from the massive underground tubers; complete eradication requires digging up every root fragment.

Keep It Thriving

Care Guide

Do

Wear heavy leather gloves and protective clothing whenever pruning or clearing stems.
Dig deep to extract the entire tuberous root system if attempting to remove or contain the plant.
Allow the vine to colonize steep slopes or coastal areas where its tough root network helps control soil erosion.

Don't

Do not plant this vine near formal garden borders, foundations, or shared property lines where its spread cannot be contained.
Do not leave severed root fragments or underground tubers in the soil, as they will quickly regenerate into new plants.
Do not apply supplemental fertilizer, as this species thrives and spreads rapidly even in low-fertility soils.

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Wildlife CoverErosion ControlNaturalizingBarrier Planting

Multiply

Propagation Methods

Good to Know

Common Questions

Common Greenbrier questions

What zones can Common Greenbrier grow in?

Common 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.

When does Common Greenbrier bloom?

Common 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 Common Greenbrier need full sun?

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

Is Common Greenbrier drought tolerant?

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