Grow Timing Query

Hello With them being photoperiod you can extend the vegetative cycle as long as you want and your space will allow. If all the plants are at least 3-4 weeks old they will flower and do well. Me personally i like at least a 6 week veg time. you could do either option, flower them all now and have 2 that are a little smaller even though they would still catch up nicely, or wait a week or two and do a bit more growth and get 3 larger plants.