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Plant Database
milk thistle

milk thistle

Silybum marianum

herbaceous☀️ full sun💧 low water Hardy: Zone 5aZone 11b

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A tall, thistle-like plant with spiny purple-pink flower heads and distinctive white-veined green foliage. Valued for ornamental appeal and medicinal seed pods, it thrives in hot, dry conditions with minimal care.

Overview

Form
Upright
Growth Rate
fast
Size
2–4′ tall × 1.5–2.5′ wide
Dormancy
deciduous
Family
Asteraceae

Native Range

Mediterranean

Seasonality

Bloom Season

J
F
M
A
M
J
J
A
S
O
N
D

Harvest Season

J
F
M
A
M
J
J
A
S
O
N
D

Season of Interest

Summer

Notable Cultivars

Most milk thistle grown is the species itself rather than named cultivars; plants are selected primarily for seed yield and silymarin content rather than ornamental traits.

Companion Planting

Plants well with