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Old 24-06-2013, 02:15 AM posted to rec.gardens
mleblanca mleblanca is offline
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First recorded activity by GardenBanter: Dec 2006
Posts: 418
Default Sudden infestation with this yellow flowered low-leaved tallgangly plant

It looks very much like a member of the mustard family.
Maybe Wintercress aka Barbarea.
Count the petals on the flower.
If there are Four petals on each flower, it is a mustard.

Emilie
NorCal