Back in the early spring the developer of the estate where I live, in order to eliminate any possibility of flooding from fields to the north, dug a 1.5 metre ditch which was then connected into the estate surface water drainage. The bare earth has now been colonised by weeds, mostly, if not all archaeophytes, all of which must have been present for several years as seed, because the adjacent fields are laid to pasture. I counted at least 33 species in the 80 metre length of the ditch, nothing rare as far as I am aware, but it will be interesting to see what happens over time. The soil is heavy clay.
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