I have never grown a green manure before and am not clear, from what I
have read, as to how exactly I should dig in the crop before it reaches
flowering time.

Does 'digging in' simply mean turning the soil over with a fork to
incorporate as much as possible of the top-growth into the top 4 to 6
inches? If I do that, won't it continue growing and sprout up again?

Or do I use a spade and start trenching and totally bury the growth
from one trench-line into the bottom of the previous trench-line? - sort
of like double digging. If so, that does sound like a lot of work.

Please help!

Ed