Re: Too much or too little water?
Mulch is a more or less a general term for any non-living soil surface cover, rocks will work too. It's about having the barrier, not so much what the barrier is. Depending on the situation there are better choices than others. For bananas, rocks should be fine but you want the layer to be thick enough to be effective, if they are small rocks maybe a 2-3" thick layer should be fine.
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Growing bananas in Colorado, Washington, Hawaii since 2004. Commercial banana farmer, 200+ varieties.
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