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I have clay soil and mine came up beautifully. I have collected the seeds - one pod renders up loads - and will be sowing them then overwintering them in an unheated greenhouse. I did this last year with penstemmons and they are now about 5 cm and very thick and healthy. I'm going to try my astilbe...might not work but it doesn't cost anything and takes no time at all. Just think of the nice surprises that might spring from this!