can you put a plant outdoors in greenhouse in april after it has been flowering under 400 hps lights indoors for three weeks? Also will two month old vegging plants, started from seed be ok in greenhouse in april as well.
I have never tried it but it seems like the nights are long enough to finish flowering a girl that's already been going. I say go for it then come back to the thread in 6-7 weeks to let us know if it worked.
You should be able to finish out the flowering one but the two younger ones might go into flower also if they've been on a longer light cycle. If you could wait some until mid May when the days are longer or try cutting back the light hours a few minutes each day to match a time to meet daylight hours. Good luck on not flowering the 2 little ones.