Very useful as a fodder crop, harmful pests & diseases will show up in the green manure rather than your more valuable veg.
It may need some protection from slugs/snails and birds especially pigeons who like to nip the tops off. It can inhibit the growth of small seeds (particularly carrots, parsnips & spinach) so a month should be left after digging it in before sowing the next crop. It does not pose a problem for transplants or young seedlings.
Sow March to September