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The Vegetative Phase of Cannabis

   Okay, so you've gotten this far, and your seedlings/clones didn't die from neglect, roasting, freezing, drowning, desiccation, starvation, over-fertilization, bugs, your cat, or from you loving them too much or raping the fan leaves. (that's a no-no) The seedlings are 8 to 10 inches tall, and growing like mad, Right? The goods: The plants will vegetate for a long time, and eventually will begin to pre-flower showing sexual maturity. If your space is limited they can be unmanageable if they're 6 to 8 feet tall. As a matter of personal choice, I would let them get only 18 inches tall before I flower, so that during the stretch, I can train them.
During the veg period, the plants should be misted every few days to simulate rain falling. This will help rinse the dust off the leaves, and freshen it up a bit. Don't overdo this, or you can leach the N from the leaves, causing chlorosis.(Yellowing) (Watch out! don't spray water on HPS or MH lights, or they may explode from the water droplets) I use a constant-flow pump sprayer to give a nice fine mist, and foliar feed with oxygenated water and a weak veg fert solution once a week or so.
The fan is oscillating 24 hours a day to disperse heat, and to blow the plants around a bit. If the plants are moving vigorously from the wind, they really seem to enjoy it, and grow like wild. They will be getting very thirsty from all the growth output, so don't withold water as this would cause stress which is undesirable at this time. During veg, you want them to grow as hard as possible, they are getting ready to produce flowers, and the more robust the plant, the bigger the flowers!
If you want to supplement with C02, now is the time to do it. You can burn a candle (in a tall glass jar) or make wine, or many other methods to produce the desired C02; Of course, they will love it, if you don't overdo it. be sure to provide outflow ventilation, as CO2 can become toxic to plants. As the plants grow, gently train them onto your screens or lines, and tie them down to a horizontal level so that the lower branches will be more exposed to the light. They will grow buds as big as on the top of the plant, and increase your yield quite a bit!