I have Limnanthes (poached egg) as a green manure and to attract hoverflies (which eat aphids). It is self-seeding, and flowers at least twice a year.
Also self-seeding Calendula and Nasturtiums.
I have planted flowers for cutting, I am bringing home armfuls of Dahlia, Aster, Marguerite, Sunflower and Jerusalem Artichoke at the moment. OK you can't eat them, but they feed your soul !

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~ What do I think of Western civilisation? I think it would be a very good idea ~ Gandhi