Posted: 12/02/2017 at 17:52
Greater Knapweed = Centaurea scabiosa
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I'm sure that info will guarantee germination
Greater Knapweed is a native, I sow all my natives as soon as ripe, (or as soon as I can get seed) then leave them outside. Some germinate immediately, other at any time from the depths of winter onwards. But never give them heat, UK plants aren't used to that sort of treatment. Cold and wet is what they're used to.