Answer: Any mulch used in the garden can be used for container conditions. Commercial packaged mulches (not decorative bark ) are fine. Tomatoes and peppers are fine container plants as long as the container is truly big enoough to accomodate the root system. One plant each per 5-gallon or larger container (a whiskey barrel is very nice) is minimum. Beans, by the way, are not happy container subjects.
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