i did a couple and they were also slow in comparison to other auto strains.
i found ,eventually, it was down to cold soil,they definately put a spurt on once id heat matted them,put bottles over them for max rh and fed only minimal dampness when feeding(plain water/weak seaweed and normal rootboost).
they also spent most of their early energy down below building their core roots and then a week later produced lots of leafage n off they went, it was easily four weeks before they kicked in the bloom maybe more.
so worth waiting abit imo,they are definately into building roots before anything else seems to happen.
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