Hairy bittercress, in germany known as Behaartes Schaumkraut, Cardamine hirsuta is an ephemeral plant native to Europe and Asia, but also present in North America. The plant is a member of the mustard family (Brassicaceae), and is edible as a bitter herb. It flowers from quite early in the Spring until the Autumn. The small white flowers are borne in a corymb on wiry green stems, soon followed by the seeds and often continuing to flower as the first seeds ripen - as you see here.
The seed are borne in siliquae which, as with many Brassica species, will often burst explosively when touched (explosive dehiscence), sending the seeds flying far from the parent plant. Seeds germinate in the Autumn, and the tiny plants are winter annual (green throughout the winter months).
This plant grows best in damp, recently disturbed soil. These conditions are prevalent in nursery or garden centre plants, and hairy bittercress seeds may be introduced with those plants. Once established, particularly in lawn areas, it is difficult to eradicate. (wiki)
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