how tall should my hydro plants be before I flower them?
Once flowering begins, the height of the plants will taper off as the plant energy is used in the flowering process itself. You can start flowering when the plants are a minimum of about 6 inches high and have at least 4 sets of leaves.This will take 2 weeks to a month of vegetative growth in most hydroponic gardens.When you want to start flowering cut the light back to 12 hours a day.nce flowering begins, the height of the plants will taper off as the plant energy is used in the flowering process itself. You can start flowering when the plants are a minimum of about 6 inches high and have at least 4 sets of leaves.