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Weed killers and Koi

Is there any product I can put under my mulch to stop the weeds and grass from invading my steeply-sloped garden, which sits uphill from my koi pond? I know Preen won't work with fish; any suggestions? It is a 30 x 30 area, so it is NOT small, and just one of the gardens in my hilly yard.
Submitted by bhartings2

Hi, I don't know of any weed killers that would be safe, close and uphill from a koi pond. You may just have to mulch heavier and pull what weeds you find. If you have permanent plantings such as shrubs you could also use landscape fabric under the mulch.

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