Question: what to sow in may?
Answer: Cabbages, cauliflowers, sprouts, and broccoli. May is probably the last month for sowing Brussels sprouts if you want them ready by the end of the year. ... 
Courgettes, pumpkins, and other squashes. ... 
Florence fennel and kohl rabi. ... 
Leaf vegetables. ... 
Peas. ... 
Melons. ... 
Sweetcorn.