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As a comment about Herb Robert (Geranium robertianum), Bonehead wrote:

Class B noxious weed in Washington, found in the understory of forests, out-competing natives. It spreads by seed, which can be ejected up to 20 feet from the mother plant. Easy to pull the shallow roots by hand, or can be controlled by mowing prior to seed set. It's a pretty little plant and I was disappointed to discover it is an invasive in my area.
Name: Caroline Scott
Calgary (Zone 4a)
Charter ATP Member Region: Canadian Bulbs Winter Sowing Enjoys or suffers cold winters Lilies
Peonies Plant Lover: Loves 'em all! Garden Ideas: Master Level
Sep 24, 2014 8:36 PM CST
Herb Robert is not too invasive here.
It is a biennial, and has been investigated for compounds
which might help some kinds of cancer.

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