Caroline Foley's expert guide to a few things to do in March

Onion sets, broad beans, carrot and spinach seed: time to get gardening this monthIn March, the pace is beginning to pick up. Harvest the last of the winter crops. Pile the debris onto the compost heap. Pick out anything diseased for the green council collection as their heaps reach a high temperature. Dig in overwintered green manures. Chopping them up first will make the task easier. For the nutrients to be of maximum use, don't bury them but turn them over lightly so they are just under the surface. Winter tares, clover and field beans will release nitrogen which will be of benefit to brassicas you plan to grow. You should be able to sow about two weeks later. However, after digging in a rye crop, wait for six weeks before sowing seed as the rye inhibits germination ? particularly in

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