This is Hairy Bittercress, Cardamine hirsuta. It is almost hairless, so the name is a bit silly. It can be pulled out easily as it is an annual, but you have to get it out early as it seeds fast and new plants appear in a few weeks. Alternatively, you can eat it, as it is a bit like watercress. It keeps scurvy at bay in the cold months as it is full of Vit C! A strategy to keep it at bay is to ensure you never have bare open soil. It cannot get in if the soil is well covered with other plants. Nature may abhor a vacuum, but Hairy Bittercress loves it!
Your Forum
This forum has now been more or less replaced by the Club's Facebook page at 
The weblog below is for naturalists to use to report interesting sightings, ask questions, report on field meetings and generally post pictures and any information or questions generally relevant in some way to the wildlife and geology of Essex. You will need to register and be logged-on to post to the forum, and you need to upload pictures first, for use in posts. Find out more
The weblog below is for naturalists to use to report interesting sightings, ask questions, report on field meetings and generally post pictures and any information or questions generally relevant in some way to the wildlife and geology of Essex. You will need to register and be logged-on to post to the forum, and you need to upload pictures first, for use in posts. Find out more