It's mostly dictated by the size of your grow area/tent. Plan on the vertical height of your plants doubling or even tripling after you flip them to 12/12 lighting. You will run out of vertical height very quickly.
Make sure you top your plants during veg and try some low stress training to keep the height down. Try to veg for at least 3-4 weeks.
It's mostly dictated by the size of your grow area/tent. Plan on the vertical height of your plants doubling or even tripling after you flip them to 12/12 lighting. You will run out of vertical height very quickly.
Make sure you top your plants during veg and try some low stress training to keep the height down. Try to veg for at least 3-4 weeks.
To be safe, when it's about 1/3 the height you have available. For you, I would say when they're around 10" to 12" tall. Learn how to SCROG to make the most out of your grow.