| I am surprised that you are having problems with the BetterGro barks.
I use their products (agricultural quantities not the little bags) and never have a problem. If you saw their greenhouses and the excellant quality plants they have (before the big box stores can damage them) you would not question the results.
I would think the problem happened while at the store. I leave mine out in the rain and mold is still not a problem.
Small sawdust in some mixes, as mentioned, is a big problem as it settles to the bottom of the pot and plugs the drainage.
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jerry  |