onions are classed as 'hungry crops' so next in line would be brassicas.you could start growing seeds under glass in feb i think, best look at the back of packet to see growing instructions though..................steve

Well Salad,
You can grow Tom Thumb lettuces and Radishes.
Sow now and see what the results are.

Yes, brassicas should follow on, definitely nothing oniony like leeks as they'll get diseased. You should manure a few weeks before you put the brassicas in.