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are all cosmos plants pernial if so which survive our winters the best



Very few of them I'm afraid. One that is, is the chocolate cosmos but that is difficult to keep going over the winter. I have lost two in successive winters and a neighbour who probably knows more about them than I do, having worked at a nursery, lost her chocolate cosmos last year.

22 Apr, 2013


Some, including the chocolate cosmos, are hardy perennials in Zones 9 and up, but most of the UK is Zone 8.

22 Apr, 2013

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