Growing these for the first time and they are growing well. They do have seed heads appearing (I read they self clean?) will these seeds be viable and come true?
Apparently they do, but I struggled to find any on my plants last year. You might do better to propagate them instead. It's quite easy to take cuttings.
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https://forum.gardenersworld.com/discussion/comment/2218035#Comment_2218035
'The power of accurate observation .... is commonly called cynicism by those that have not got it.
George Bernard Shaw'