depends upon the size of the seeds and if
you've repotted into more fertile medium than
seed starting mix. usually i would only
supplement fertilize only if the plants are
showing signs of deficiency (why waste $?)...
only when actively growing and showing
signs of deficiency.
after a few years of planting various things
you should have some idea of what is normal
given your other conditions (like this year we've
had a lot of rain but not much sunshine so plants
will be lagging a bit).
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