Botanical profile

Blessed thistle

Latin name
Cnicus Benedictus
Common name
Holy Thistle
Type
Annual medicinal plant
Family
Asteraceae

Blessed thistle is an annual medicinal and aromatic plant with a naturally spiny habit, appreciated for its dissected foliage, unique texture, and yellow flowers surrounded by prickly bracts. Its wild and structured appearance brings character to medicinal herb gardens, naturalized landscapes, specialized kitchen gardens, and collections of less common fine herbs. It is particularly interesting for gardeners seeking a useful, distinctive plant rich in botanical history.

Easy to grow, blessed thistle prefers a sunny location in light, well-drained, and moderately fertile soil. It tolerates drier conditions quite well once established, making it a good option for Mediterranean-style gardens, natural borders, and spaces where robust plants are desired. Its spiny foliage simply requires a bit of space and careful handling during maintenance or harvesting.

Traditionally recognized as a medicinal plant, blessed thistle is also cultivated for its ornamental interest, unique flowering, and its role in biodiversity-friendly gardens. Its architectural silhouette pairs well with yarrows, salvias, grasses, cornflowers, and other full-sun plants. It is an ideal plant for adding a wild, textured, and botanical touch to a medicinal garden, dry border, or natural landscape.

Care guide

Care level
Easy

Choosing this plant

Main benefit
Annual medicinal plant with thorny foliage and decorative yellow flowers
Medicinal garden, natural vegetable patch, country-style flowerbed, pollinator garden
Container growing
Container growing is possible in a deep, well-drained pot
Seasonal care
Harvest the aerial parts before full bloom; wear gloves due to the spiny foliage; avoid waterlogged soils
Growing conditions

Light, soil, water and hardiness

Hardiness zone
Not hardy
Exposure
Full sun to partial shade
Watering
Moderate; allow the soil surface to dry slightly between waterings
Humidity
Low to medium humidity; prefers well-drained soils
Fertilization
Light compost at sowing; avoid excessive fertilizer
Soil type
Light, poor to medium, dry to fresh, well-drained soil
Soil pH
Neutral to slightly alkaline
Minimum temperature
32 °F
Propagation method
No-till farming
Plant appearance

Blooming, foliage and shape

Blooming period
Summer
Flower color
YELLOW
Fruiting
Late-season seeds
Foliage color
Grayish green
Foliage type
Obsolete
Shape
Upright, branched, and thorny habit
Garden structure

Size and growth

Height
30 to 60 cm (12 to 24 inches)
Width
30 to 45 cm (12 to 18 inches)
Growth rate
Rapid growth
Vegetable garden and yield

Companion planting, spacing and harvest

Companion plants
Marigold, sage, yarrow, lavender
Plants to avoid
Avoid with small, fragile plants (risk of shade or competition)
Spacing
30 to 45 cm (12 to 18 inches)
Harvest period
July to September
Not recommended for pets
Not recommended for pets

Pets

Deer
Less attractive or generally tolerated by deer

Deer

The availability of our plants varies depending on arrivals, seasons, nursery production and supplier availability. Some varieties may be offered for a limited time only, depending on their natural cycle or current stock. These plant profiles are designed to guide and inspire you when choosing plants for the garden, landscaping projects, containers or long-lasting outdoor arrangements.