Silybum marianum
Milk Thistle
Silybum are large annuals and biennials. They form basal rosettes of large, lobed leaves and, in Summer, bear thistle-like purple flower-heads with spiny bracts. Silybum marianum is a biennial with spiny dark green leaves with prominent white veins, and with purple flower-heads with spiny bracts in the second year
Contributed by @SikoMa
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Full sun
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Occasional watering
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Frost Hardy: 23F (-5°C)
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Free draining
Common name
Milk Thistle
Latin name
Silybum marianum
type
Annual or biennial
family
Asteraceae
ph
6.6 - 8.5 Acid - Neutral
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Light
Full sun
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Frost
Frost Hardy: 23F (-5°C)
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Soil
Free draining
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Water
Occasional watering
Plant & bloom calendar
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Best time to plant
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When the plant will bloom
full grown dimensions
1.00 M
1.50 M
Silybum marianum
Silybum are large annuals and biennials. They form basal rosettes of large, lobed leaves and, in Summer, bear thistle-like purple flower-heads with spiny bracts. Silybum marianum is a biennial with spiny dark green leaves with prominent white veins, and with purple flower-heads with spiny bracts in the second year
Flowering
From Early Summer TO Late Summer
The purple flower-heads appear in Summer
Planting
From Early Spring TO Late Spring
Plant in a sunny, sheltered site, in free-draining fairly poor, neutral to alkaline soil
Propagating by seed
From Late Spring TO Early Summer
Sow seed in situ in late Spring to early Summer. Sow seed thinly in moderately poor but free-draining soil that is ph neutral to slightly alkaline. Thin seedlings to 1 m apart
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