Onopordum acanthium

This grand native thistle can stand upwards of 8ft once fully developed, topped with a candelabra of mauve flowers that bees will adore. More
30 seeds 156021 £5.50 In stock
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More Details

A superb, statuesque feature plant. This grand native thistle can stand upwards of 8ft once fully developed. The biennial will form a dense rosette in its maiden year, felted with white down and spiny foliage. In the second year, the towering flower stem erupts from a base of large, silver, acanthus-like leaves, topped with a candelabra of mauve flowers that bees will adore.

Genus Onopordum
Group/Species acanthium
Type Biennial or Short-lived Perennial
Common Name Scotch Thistle
Border Position Border (Back)
Soil Type Alkaline - Neutral
Site Full Sun
Moisture Well-drained
Height 1.8m (6ft)
Spacing 1.2m (4ft), will need a sturdy support.
Sowing, Seeds, Planting Sow thinly onto trays of seed compost and place in a cold frame, unheated greenhouse or shady corner of the garden. Keep moist. Seeds require a period of cold and damp, sometimes up to a year before they will germinate. Once seedlings appear and have developed a pair of 'true' leaves, prick out on pot on into individual modules or pots. Plant out in their final growing position in spring or autumn. Prefers moist but well-drained soil in partial shade. Incorporate plenty of organic matter into the planting area and dig a hole deep and wide enough to cover the roots. Sprinkle mycorrhizal fungi into the base of the planting hole, position plant in the hole, backfill and firm soil around the plant. Water in well until established. May also be sown direct.
Care Tips Will self-seed freely, lift young seedlings and transplant elsewhere in the garden. Requires a sturdy stake or it will topple in strong winds.
Flowering June - August
Harvesting Flowers June-August. Self-sows.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  • Sow Under Cover/Plant Indoors
  • Direct Sow/Plant Outdoors
  • Flowers/Harvest
Advice

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Delivery

Plant Delivery - When in stock, please allow up to 3 weeks for delivery. 

Seeds Delivery - Following the recent relocation of our warehouse, please allow up to 5 working days for despatch.

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