posted 4 hours ago
What sort of growing medium did you start with? I would start my tomato seedlings in a compost mix that could feed them just fine for 6-8 weeks with just water. I did not need any extra "food".
As for how to know if they need more feeding... I'm not an expert, but I would look out for things like discolored leaves (signs of stress or deficiency), withered leaves, lack of any growth over a week or two, and things like that.
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