I wonder how they would do in seed starting where nutrients aren't really necessary. They might be a lot cheaper than potting soil, coir or peat.I don't like rice husks for growing plants. They by their very nature are tough (to protect the kernel) and resist moisture. They also decompose very slowly and add almost no nutrients to the soil. So why do some growers use them? Because there are literally tons of them left over during rice production every year.
The hulls would probably be great for cacti and bonsai. You could add a little peralite for moisture retention if needed. I was also wondering if you could do a form of hydroponics since they don't readily decompose. Hmmmm. I feel some new experiments coming on.
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