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May 11, 2020 12:54 PM CST
San Francisco Bay Area
This groundcover plant seems to be growing everywhere in the moderate SF Bay Area. Very vigorous. In good light it's covered in these spherical inflorescences that look a bit like clover (superficially) that fade from pink to white. Comes up volunteer in places that get regular water. This photo is a volunteer growing under a Meyer Lemon tree.

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Last edited by SFBayAreaGardener May 11, 2020 12:59 PM Icon for preview
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May 11, 2020 1:12 PM CST
Name: Kelly
Redding, California (Zone 9b)
Bee Lover Birds Garden Photography Orchids Xeriscape
Polygonum capitatum, a low growing Knotweed.
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May 11, 2020 1:21 PM CST
San Francisco Bay Area
So, not a weed?

Seriously, this is widely planted. It is a fast covering plant with attractive leaves, evergreen and covered in pink flowers essentially all year in our climate. But, it seems to me that it has great potential to become invasive

Very pretty actually. It does seem to be be limited by water, which will keep it from being too invasive here in California.

Thank you so much for your quick response.
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May 11, 2020 1:43 PM CST
Name: Kelly
Redding, California (Zone 9b)
Bee Lover Birds Garden Photography Orchids Xeriscape
SFBayAreaGardener said:So, not a weed?

Seriously, this is widely planted. It is a fast covering plant with attractive leaves, evergreen and covered in pink flowers essentially all year in our climate. But, it seems to me that it has great potential to become invasive

Very pretty actually. It does seem to be be limited by water, which will keep it from being too invasive here in California.

Thank you so much for your quick response.


"Weed" is a matter of context. While some gardeners in your area may plant it, I'm guessing that many others had it arrive as a "weed". In your mild climate it may be considered an invasive species. At least it is pretty. Most of my weeds aren't. nodding
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May 11, 2020 1:51 PM CST
San Francisco Bay Area
Nor my weeds. Especially the knotweed (different species) which most certainly is a weed. I guess some knotweeds are not. Weeds, that is.
Last edited by SFBayAreaGardener May 11, 2020 1:52 PM Icon for preview
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May 11, 2020 2:33 PM CST
Name: Lin Vosbury
Sebastian, Florida (Zone 10a)

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Polygonum capitatum is apparently a synonym; here's our database entry for your plant: Pink Knotweed (Persicaria capitata) and a couple of member photos for comparison:

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