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close windowPlant list: Biennials
If you sow biennial seed, you’ll get leaves in year one, followed by flowers in year two. Many biennials are sold as two year old plants, ready to flower.
Onopordum acanthium, Cotton thistle
Latin nameOnopordum acanthium
Common nameCotton thistle
Type of plantBiennial
HardinessHardy
Flower colourPink
Leaf colourSilver-grey
Height and spread180cm x 90cm (6ft x 3ft)
Description
Tall thistle-like plant with prickly leaves. Will grow in sun or partial shade. To prevent self-seeding remove dead flowers, and protect leaves against slug and snail damage.
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Hardy annuals
Half-hardy annuals
Biennials
Hardy perennials

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