We've just been given a quarter plot at our local allotment, but we've realised that we've pretty much missed the planting season for most things. It's not totally over grown, but there's a bit of grass that's gone a bit mad, there's an onion patch, an unnamed brassica, but that's about it. We were hoping we'd get the side of the half plot that's been divided that had rhubarb but we weren't lucky on that front. Would we be best off planting a green manure and waiting until the spring or should we just put black plastic down and think about winter planting?