organic black knapweed
$ 4,50
Centaurea nigra, Asteraceae
hardheads, black knapweed
Black knapweed is both food for bees and a beautiful flower to cut. This potentially invasive species is of European origin, naturalized in Quebec. It is a hardy perennial in zone 3, with erect stems that are covered with purplish-red flowers above fat, hairy involucres, from July to September. 30-75 cm tall.
70-80 seeds
Seeds certified organic by Québec Vraiproduced here at LA SOCIÉTÉ DES PLANTES
In stock
Press seeds onto the surface of moist potting soil (no more than 2 mm deep) and store at 15°C-20°C until germination, which will take up to 15 days. Transplant the seedlings into individual 8 cm pots and, when well rooted, transplant at a minimum of 15 cm between plants.
| # of the lot for sale | SDP20 |
|---|---|
| Germination rate for 2024 of the lot on sale | 70% |
| Test germination conditions | Light, 15ºC to 18ºC |
| Number of seeds per bag | 75 |
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