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kansabis
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I would think with a big bed like that and a heavy mulch layer you wouldn't need/want to water as often,but I've never done beds like that only small pots and the sand/de helped me with fungus gnats.I have a heavy mulch layer on top with living mulch growing through it. I have a crop duster that I have put diatomaceous earth over the mulch layer recently. Ima let it dry on the surface as best I can without it being bone dry. Some bugs aren't a problem, what I have is definatelly a problem for me