Clone help are they monster

[Newgrow31]

I was given some rooted clones that where kept outside as the days got shorter they started to flower iv had em a week or too under 24/0 and 18/6 there abkut 12-16" but getting yellowing leaves after potting on also the calaxes crusting up and easily nocked off.is it because they need feeding or are they just starting to revege iv had much growth i dont think