Hi

Use any variety weed and feed with mosskiller, this kills most weeds in lawns but use as instructed it can still kill grass if too much is used. (it seems to speed the weeds on until they die)You will have to direct weedkiller only at weeds in flower garden, use a soil inert type such as weedol or tumbleweed only use on a still day and keep container/spray only for weedkiller.

Regards
murf