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Tue, Oct 9, 12 at 15:36
| The real question is if there is still a point of digging them out right now, or if I can just let the frost/winter kill them? |
Follow-Up Postings:
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| The ones that grow in my mom's yard are perennial, but there may be annual or biennials varieties as well; I am not sure. |
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| The roots of perennial thistles here in Europe grow very deep, they usually come back several times after being dug up. |
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- Posted by gardengal48 PNW zone 8 (My Page) on Tue, Oct 9, 12 at 17:42
| The term thistle applies to so many different genera, it's hard to be very precise :-) Common thistles, Cirsium species, are perennials and biennials. Relying only on winter cold to kill off the plant is risky and unreliable. And most species are tap rooted as well, so digging out is a challenge. |
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- Posted by SunnyBorders 5A (My Page) on Tue, Oct 9, 12 at 23:25
| The biennial ones spread by seed. Assuming the frost/winter won't kill that. |
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