Thanks for the input, KAMasud.
While I've never been a big fan of Miracle Grow potting soil, I tried some of their "moisture control" potting mix this summer in a few big pots this summer. It contains coir, though I don't know what percentage. Even in the unprecedented heat and drought that we had in the midwest those containers did great. This was shortly after planting in April.
This was in August
So I agree, some coir in a mix can help a lot in moisture retention. I don't know what percentage is necessary though.
In the past I had tried pure coir for seed starting and I failed miserably.
Karen
