In article ,
Gary Woods wrote:

What green manure can I sow (late in the year) to reduce this
effect?

I would like something that is dense enough to discourage grass
etc. from growing and setting seed.

Is buckwheat grown in the U.K.? It used to be used for weed control here
in the U.S., because it crowds out most weeds. I use it in empty patches in
the summer, and winter rye in the fall, so be tilled in the next spring.

According to the RHS, it won't grow here in the autumn. Rye sounds
worth a try, though.

Regards,
Nick Maclaren.