Cotton Thistle
Onopordum illyricum
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Pl. C1D8 — Onopordum illyricum
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IOverview
Overview
Cotton Thistle (Onopordum illyricum) is a biennial forb or herb native to regions including Albania, Baleares, Bulgaria, Corse, East Aegean Islands, France, Greece, Iran, and parts of Italy, Lebanon-Syria, Portugal, Romania, Sardegna, Sicilia, Spain, Turkey, and Yugoslavia. This plant thrives in moist conditions with a preference for light (sandy), medium, or heavy (clay) soils, growing up to 1.3 meters tall. It is known for its edible flowers, making it a culinary delight. Cotton Thistle is hardy in zones 6-9 and can be found in various habitats across its native range. Its distinctive feature includes the presence of spiny leaves, which are characteristic of thistles.
Quick answers
What is Cotton Thistle?
Cotton Thistle (Onopordum illyricum) is a biennial forb or herb native to regions including Albania, Baleares, Bulgaria, Corse, East Aegean Islands, France, Greece, Iran, and parts of Italy, Lebanon-Syria, Portugal, Romania, Sardegna, Sicilia, Spain, Turkey, and Yugoslavia.
Growingconditions · propagation · uses
VCultivation
Cultivation
Cotton Thistle thrives in light to medium soil types and prefers a pH between 7.5 and 8. It is hardy in temperate regions with zones 6-9, making it suitable for gardens in these climates. This biennial plant requires moist conditions but can tolerate various soil textures from sandy to clay. For optimal growth, provide ample light; the flowers are edible parts that can be harvested. Water regularly to keep the soil consistently moist, especially during dry periods.
Light
8/10
Water
Moist
Soil
Light (sandy), Medium, Heavy (clay)
Hardiness
6-9
Life cycle
Biennial
Habit
Forb/herb
Mature size
1.3 m tall
Soil pH
7.5–8
For first-time growers
How to grow Cotton Thistle for the first time
8steps
Start with Cotton Thistle as a simple, low-maintenance addition to your garden.
- 1
What you'll need
Seeds or young plants, a trowel, and a watering can.
- 2
Best time to plant
Plant in spring after the last frost or in early fall for biennial growth.
- 3
Soil and container prep
Choose a location with well-draining soil that is light (sandy), medium, or heavy (clay). Ensure the pH is between 7.5–8.
- 4
Sowing or transplanting
Direct sow seeds in the garden or start them indoors and transplant after danger of frost passes.
- 5
First two weeks
Water regularly to keep soil moist but not waterlogged, especially during establishment.
- 6
Ongoing care
Provide consistent watering, especially during dry spells. Prune dead or damaged leaves as needed.
- 7
Harvest or pruning
Prune flowers for aesthetic purposes or to prevent self-seeding. Remove any yellowing foliage to maintain plant health.
- 8
Common mistakes
Overwatering, planting in poorly draining soil, and not providing enough space between plants.
VIEdible & utility
Edible & utility
Edible parts:Flowers
Edible uses: The flowers of Cotton Thistle are edible and can be consumed raw or cooked. They are often used in salads for their mild flavor. SKIP
Contextrange · companions · related
VIIDistribution
19 native · 4 introduced
Distribution
19 native · 4 introducedDistribution across2 continents· 19 native· 4 introduced
Europe8 regions
native (8)AlbaniaBulgariaFranceGreeceItalyPortugalRomaniaSpain
Asia3 regions
native (3)IranIraqTurkey
Broader regions
native:East Aegean Is., Kriti, Lebanon-Syria, Yugoslavia
introduced:California, New South Wales, South Australia, Victoria
IXSpecimen gallery
1 image
Specimen gallery
1 imageXI
Explore further
Companion planting
Growing zone
XII
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