Lancashire,
United Kingdom 
How do i get rid of moss on my raised bed. Can I use lawn moss killer, I grow vegatables on the raised bed ,but the moss keeps coming back
10 Aug, 2010
Answers
And no, you can't use mosskiller where you want to grow plants other than grass. Sign of poor drainage (as Docbob says) or stagnant, unworked soil in a shady, damp position.
10 Aug, 2010
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You need to change the texture of the soil/compost, it does not have enough drainage. Apply a good dressing of horticultural grit.
10 Aug, 2010