Window grow just past the 3 week stage...should I start using a tiny amount of mutes?

The science behind all this is a bit baffling so I figured I'd just throw this out there...

The bottle of Bio-Bloom I have clearly states it should be used at the flowering stage but, would a more diluted dose help my plants?
I'm fine to be patient & wait but I don't want to miss any tricks, or an opportunity to give my plants a little lift. They're small but it's to be expected...

This is the small print on the soil I'm using...

FloraGard.jpg

...and these are 2 of my plants...

Seedlings - Week 3.jpg

I have 4 in total, all a similar size, & I'm trying out different methods - some have been transplanted to 11 litre pots & I'll use LST on at least one of them when the time is right. All the transplants had Mycorrhizae added to the root area before being re-potted.

It's really just the feeding part I'm have trouble with. Are there enough nutrients in the soil?
 
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