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Unidentified weed

Observed: 4th May 2011 By: JosephineJosephine’s reputation in PlantsJosephine’s reputation in Plants
young plant 4.5.11 IMG_5566
young plant 4.5.11 IMG_5566 1
young plant 4.5.11 IMG_5566 1 2
Description:

Starts as grey-silver rosettes of leaves. Fairly fast growing.
Tall flowering stems were under shrubs at edge of bed in park.
Leaves on flowering stems are toothed but some have rounded ends and some are pointed. Height when flowering about 30-40 cm. Soil is poor, stoney clay I think, very hard to dig.
I'd like to know how it spreads!

Identifications
Species interactions

No interactions present.

Species with which Hoary Cress (Lepidium draba) interacts