You can treat the seedlings anytime. I have mixed seaweed meal and
seaweed powder into the seedling grow media that I was potting up
sprouted seedlings into. I have also watered them with some diluted
liquid seaweed extract. No ill effects.
I have sprayed larger plants with it without problems. I expect it would be
ok to spray seedlings, too. (You can always test with a few test seedlings
if you have doubts.)
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