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Potentilla turns invasive

Posted by deb5315 Z5 Colorado (My Page) on
Tue, May 29, 07 at 11:43

I used Potentilla nepalensis 'Ron McBeath' (Miss Willmott Potentilla) as a groundcover in a landscape installation. The following season most of the original plants had died, but seemed to be replaced by potentilla anserina, AKA Silverweed. The leaf became small and ferny in appearance and the bloom changed to small yellow blooms, and numerous red runners formed an invasive mat. The second year, this had invaded the lawn up to 40 feet away.

I am wondering if it is possible that the Miss Willmott variety was a hybrid that seeded, and the seeds produced a throwback to p. anserina. They are both of the Rosaceae family, and p. anserina is not common in this state.

Can anyone explain or confirm what happened here?


Follow-Up Postings:

RE: Potentilla turns invasive

They are not very closely related (Silverweed has been split out into a separate genus by some botanists, as Argentina anserina). I'd suspect the most likely cause is a stray Silverweed root in one of the pots, from its being a weed at the nursery.

If the spread is very rapid, do all you can to stop it, before it ends up as a new Colorado-wide menace!


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