Hi Annie, I know that some of the best fertilizers are based on molasses, so I bet they're right. It provides a good source of K. I was going to use rice straw for my mulching last year, but I couldn't locate a place to buy it for a decent price. I ended up going for the more manageable redwood chips, which breakdown slower. I'm not sure they're any better or worse for mulching a tomato garden though.
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