Growth begins with the rooting period, sensitive period, which requires a high humidity: 60% to 80%.
The soil should not be fed. In hydro, very little fertilizer: EC = 1.
Some cutting hormones or products helping to rooting amply suffice.
Once the firstleaves are there, vegetative growth begins.
Indoors, wanting to grow plants with a height of 2 meters is a strategic mistake.
The fluorescent tubes does not provide more than 10cm penetration, CFL lamps 20cm and 30cm for Hid lamps.