Janezee, it can't hurt to change your seed starting medium when you have some troublesome seeds. Although I haven't had much trouble with tomato germination this year, I have had some issues with certain pepper varieties. In my first sowing of peppers, with Chinese Giant bell peppers I got zero germination with 9 seeds sown in Jiffy mix. In my second sowing I planted 12 seeds in Jiffy mix and 12 seeds in DE. I got 5 strong seedlings pronto in DE and 2 in Jiffy mix. Go figure.
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