At TH Clements near Boston the cauliflower crop is being harvested but the rain means they are currently 4-5 weeks behind. Planting schedules are having to be rearranged to fit in a second crop to try to avoid shortages.
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The charity has released photos showing how easily animals can get tangled in sports or garden netting - which can result in fatal injuries.
Beverley, Doncaster, Leeds, Northallerton, Ripon and York have also named as race starting venues for the nine-day event.
Today's forecast with Jon Mitchell