I use whatever is in stores, and it isn't an issue for tomatoes. Peppers I am quite particular about. Fertilome and Fafard are excellent for peppers. as is the ProMix- BX.These products contain bark fines whereas lower priced mixes are heavy on peat with no fines.
I'm just going to throw this out off the top of my head …. are you feeding your transplants?
I feed my peppers only two or three times at most during their stay indoors. Tomato seedlings get fed a low strength snack quite regularly. Perhaps it is a fertilizer issue.
- Lisa
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