Greenbrier (Smilax bona-nox)

Greenbrier

Smilax bona-nox

Its thorny stems weave dense green thickets, a tough understory survivor. Deciduous to evergreen vine; common names: catbrier, bullbrier.

Partial sun
1–2/week
Moderate
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Plant Needs

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Sunlight Prefers partial to full sun; tolerates dappled woodland shade; avoid intense midday sun in hot climates
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Watering Water deeply when the top 5 cm of soil is dry; drought-tolerant once established
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Temperature Hardy to -10°C; adapts to temperate and subtropical climates; avoid prolonged temperatures above 38°C
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Characteristics

  • Leaf: Alternate, ovate to heart-shaped, glossy green with prominent veins; some have small prickles on petioles
  • Stem: Woody, sprawling stems armed with sharp, recurved prickles for climbing and anchorage
  • Flower: Small, greenish-white, fragrant blooms clustered in axillary umbels
  • Fruit: Dark blue to black spherical berries, persistent on stems through winter
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Care Guide

Watering

Maintain even soil moisture during active growth; avoid waterlogging

Fertilization

Apply a thin layer of compost once at the start of growth. Avoid synthetic fertilizers to prevent excessive foliage growth at the expense of fruiting

Composted banana peel tea:Steep fully composted banana peels in water for 3 days; dilute 1:20 for root drench; discard solid debris to avoid pest issues
Pruning
  • Trim overgrown stems in late winter to control spread and maintain desired shape
  • Remove dead or damaged growth in early spring to improve airflow
  • Cut back dense thickets to reduce overcrowding and encourage new growth
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no known adverse effects from ingestion

Humans: Non-toxic to humans; young shoots are edible when cooked

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Garden Uses & Culture

Culture: N/A

Usage: Erosion control on slopes; berries provide winter food for birds; young shoots are edible when boiled