1 named cultivar

‘Bonfire’Crown of Thorns 'Bonfire'

cactus succulent

Crown Of Thorns

The Story

Plant Bio

Euphorbia milii, crown of thorns, is a dense multi-stemmed succulent shrub from Madagascar, three to six feet high and half as wide again. Sharp black spines half an inch long cover the branches, broad evergreen leaves cluster toward the tips, and pairs of bright red or pink bracts an inch or more across appear almost continuously in warmth.

What look like flowers are bracts, which is why the colour lasts for weeks rather than days and why the plant seems to flower all year in a warm room. The spines are genuinely sharp and the milky latex burns skin and eyes, so it is a plant to site away from paths and small children — a reputation the common name does nothing to soften.

Uses & Benefits:

Bright red or pink bracts carried almost continuously above spiny evergreen stems.

Extremely drought-tolerant and flowers year-round in a warm bright room.

Pollinators visit the bracted flowers where it is grown outdoors in frost-free regions.

Essentials

At a Glance

Plant Type

Cactus Succulent

Height

48 inches

Width

27 inches

Light

Full Sun, Partial Sun

Zones

9, 10

Water

Low

Humidity

Low

Lifespan

Perennial

Native To

Madagascar

Toxicity

Toxic; latex burns skin and eyes

Planting

How to Grow

Grow in full sun; light drives the bract display.
Use gritty, sharply draining compost.
Let the compost dry fully between waterings.
Keep it frost-free and dry in winter.
Wear gloves and eye protection when pruning.
Site it away from paths and play areas.

Pro Tip

Wear gloves and keep the milky latex away from your eyes — a cut stem can spray, and it burns rather than merely irritates.

Keep It Thriving

Care Guide

Do

Give it full sun for constant bracts ☀️
Let compost dry fully between waterings 🌵
Wear gloves when pruning 🧤
Site it clear of paths 🚸

Don't

Overwater it ❌
Let the latex touch eyes or skin ❌
Expose it to frost ❌

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Rest
Water

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Bright windowsill houseplantContainer on a hot patioDry frost-free garden bed

Companion Plants

Agave AloeJade Plant EcheveriaSansevieria

Multiply

Propagation Methods

Good to Know

Common Questions

Crown Of Thorns questions

What zones can Crown Of Thorns grow in?

Crown Of Thorns is hardy in USDA Zones 9–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Crown Of Thorns deer resistant?

Yes — Crown Of Thorns is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Crown Of Thorns bloom?

Crown Of Thorns typically blooms in year-round in warm conditions through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Crown Of Thorns need full sun?

Crown Of Thorns does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Crown Of Thorns drought tolerant?

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