A soil or soilles medium that holds too much water is a problem. A recent purchase of peat w/ vermiculite is so fine it packs hard and holds too much water. A long time between waterings. IMO that has contributed to poor performance of my seeds.
Larger particles mixed inwould fix the above mentioned potting mix. Adding more vermiculite was not succesful.
I mix in azomite and long release orgainic fertilizer into my commericail potting mix, as there is no fertilizer in the brands available nearby to buy.
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