Photo of Silybum marianum flower by Annie's Annuals & Perennials

Photo by Annie's Annuals & Perennials

Used with permission, all rights reserved

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Silybum marianum

Also Known As

  • Blessed Thistle
  • Milk Thistle
  • Our Lady's Blessed Thistle

Plant type

perennial, herb

size

  • H: 1'-4'
  • W: 2'

planting zones

  • 5a-10b

More Options

Silybum marianum plant details

Silybum marianum is a broadleaf semi-evergreen perennial herb with blue and green foliage. In summer purple flowers emerge. Features glaucous texture. Grows well with sun and regular - low water. Drought tolerant once established. Adapts to various soil conditions.

CHARACTERISTICS OF Silybum marianum

Plant type: perennial herb
Plant family: asteraceae
Foliage: semi-evergreen blue and green
Mature size: 2 FT wide, 1 FT - 4 FT - tall
Flowers: purple blooms in summer
Uses: container plant, cutting garden, medicinal, potentially invasive, self-sowing, spiky

GROWING CONDITIONS for Silybum marianum

USDA Zones: 5a - 10b
Sun exposure: sun
Watering frequency: regular - low
Resistant to: deer

Nursery contributed plant descriptions

Used medicinally for over 2,000 years, “Milk Thistle” herb is revered as a liver tonic, commonly used for its protective effects on the liver & to improve liver function. The seeds help protect the liver cells from chemical damage & will regenerate cells, which have already been harmed from drugs, alcohol, radiation, or toxic chemicals. It’s often included in formulas for people with hepatitis, cirrhosis & anyone receiving radiation treatments. Traditional “Milk Thistle” extract is made from the seeds containing the flavanoid complex “silymarin”. (You can google “milk thistle harvesting” for simple instructions.) Silybum marianum grows 1-3’ tall forming a large attractive rosette of waxy lobed thorny leaves with white veining. In Summer, solitary showy violet “thistle” flowers appear atop strong upright stems. Growing in any soil, it can be invasive in the garden if the seed heads are not harvested - so be careful to remove them to prevent seedlings. Easily grown in a container too.

Gardening facts about Silybum marianum plant

How to Grow Silybum marianum

  • Sun Exposure

    • sun
  • Water Needs

    • regular - drought tolerant
  • Soil Needs

    • adaptable

Features

  • Foliage Color

    • green
    • blue
  • Flower Color

    • purple
  • Wildlife

    • deer resistant
  • Flower Season

    • summer
  • Foliage Season

    • semi-evergreen
  • Texture

    • glaucous
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