I planted some Nigella persian Jewls Mixed in drills and they have grown/sprouted. But now it looks a bit crowed/messy, should I prick them out and space them apart. Also do I still need to think about the spacing specified on the packet or does it not matter.
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I would say it doesn't matter as they self seed in crowded clumps anyway. If you really think they're too crowded, you can thin them out, but I'm not sure that they transplant well.