Ok 2×2 is a decent hole, most times when planting in the ground it's not usable soil, the existing soil has no nutes, often clay where I'm from but dry dirt where you are, so its basically like digging a pot in the ground and planting.
Ok the fine line is around 15 hrs, if they are showing hairs then they are certainly ready to flower, then yes let them do their thing and flower start feeding bloom.