Common Knapweed - Centaurea nigra - Native Wildflower
| Type: | Perennial |
| Approximate height: | Up to 75 cm |
| Flowering Time: | June to September |
| Site and soil type: | Well-drained soil in sun or partial shade |
| When to sow: | Spring to autumn |
| Where to sow: | Outside, direct into soil or under cover, into trays, modules or pots. |
| Packet contents: | Approximately 150 seeds / 0.33 g |
Common Knapweed, also called Black Knapweed or Hardheads, is a tall native plant with thistle-like purple flowers, found in the wild in meadows, field edges, road verges and waste ground.
It blooms from June to September and is very popular with Bees, Butterflies, Moths and Beetles. Once it has flowered and set seed it may also attract seed-eating birds such as Goldfinches.
Common Knapweed attracts and provides food for many different species including:
- Bees
- Beetles
- Butterflies including Marbled Whites 🦋 and Meadow Browns 🦋
- Moths, including: Scarce Forester moth 🐛, Black-veined Moth 🐛, Dusky Sallow 🦋 and Haworth's Minor 🦋
- Bats🦇
- Seed eating birds such as Goldfinches
- An "RHS Plants for Pollinators" plant **
All our seed packets include sowing instructions.
Jemima’s Garden seeds are plastic free and reyclable. They’re contained in an inner glassine envelope, (made from pine wood cellulose), and an outer Kraft paper seed packet. Any shipping packaging is also plastic free and recyclable.
** RHS Plants for Pollinators. The RHS Plants for Pollinators mark is only given to plants that support pollinating insects. Find out more at rhs.org.uk/plantsforpollinators
** The Royal Horticultural Society, and its logo, are trade marks of The Royal Horticultural Society (Registered Charity No 222879/SC038262) and used under licence.