Fine Herbs

Milk thistle

Milk thistle is a medicinal plant with thorny green foliage marbled with white and very decorative purple flowers, perfect for a sunny natural garden.
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Exposure
Full sun
Hardiness
Not hardy

Discover the plant

Common nameMilk thistle
FamilyAsteraceae
TypeAnnual or biennial medicinal plant
Botanical nameMilk thistle

Milk thistle is a very distinctive medicinal annual or biennial plant, recognized for its white-marbled green foliage and large, wild-looking purple flowers. Its robust and architectural habit brings height, texture, and a lot of character to medicinal plant gardens, naturalized flowerbeds, specialized vegetable gardens, and country-style landscapes. Very decorative, it easily stands out with its contrasting spiny leaves and its original, eye-catching bloom.

Easy to cultivate, milk thistle prefers a sunny location in well-drained, light to moderately fertile soil. It tolerates dry conditions quite well once established and is suitable for gardens requiring resistant, structured, and low-maintenance plants. As its foliage is spiny, it is best to reserve a spot for it where it can develop without hindering passage, at the back of a flowerbed, in a medicinal garden, or in a naturalized area.

Traditionally recognized as a medicinal plant, milk thistle is also appreciated for its ornamental interest and its ecological value in the garden. Its flowers attract pollinators, while its seeds can attract certain birds at the end of the season. It is an ideal plant to add a strong, botanical, and textured presence to a useful plant garden, a wild border, or a sunny landscape with a natural style.

Milk thistle

Planting guide

From planting to establishment.

Propagation Direct seeding

Soil and care

The right care,at the right time.

Soil pH

Neutral to slightly alkaline

Minimum temperature

32 °F

Care level

Easy

Watering

Moderate; allow the soil surface to dry slightly between waterings

Soil type

Light to medium, dry to cool, well-drained soil

Fertilization

Light compost for seedlings; avoid excessive fertilizer

Moisture

Low to average humidity; tolerates drought once established

Seasonal care

Harvest seeds when ripe; wear gloves to handle the spiny foliage; deadhead flowers to limit self-seeding

Container growing

A garden,within reach.

Possible to grow in a large, deep, well-drained container
Milk thistle

Bloom and dimensions

Its place,in your garden.

Mature height

90 to 150 cm (36 to 60 inches)

Width / spread

60 to 90 cm (24 to 36 inches)

Flower color

Purplish pink to purple

Foliage color

Green mottled with white

Foliage type

Obsolete

Growth rate

Rapid growth

Bloom period

Summer

Fruiting

Medicinal seeds at the end of the season

Harvest

August to October
Milk thistle

Garden associations

In goodcompany.

Companion plants

Calendula, yarrow, sage, lavender

Plants to avoid

Avoid with small, fragile plants (risk of shade or competition)

Wildlife and pets

Life,around your plants.

Supporting wildlife

Bees, butterflies