I personally had a lot of issues with big box stores mixes which would sit out in the elements and get rained on and grow gnats and who knows what else. When I first started I would buy this mix after it sit outside all season and then get it on sale thinking I was getting a bargain but no more.
I now only buy the good stuff but more importantly, I only buy new soil that was made for the new season (or at least I think it's new, it gets put out after their old soil is on clearance). And lastly, it has to be stored indoors or I don't buy it...
The last season I bought the bad gnat infested stuff I found out you could buy "mosquito dunks" and break up a dunk over the top of the mix, the dunks would get eaten by the gnats and kill them, but why hassle?
Al
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