If you are starting seeds for the first time, you may want to limit yourself to no more than ten different types of plants. You can start your seeds in almost any type of container as long as it is at least 2 to 3 inches deep and has some drainage holes. For best results, we recommend a seed-starting system, such as our GrowEase Seed Starter Kit.
https://www.gardeners.com/how-to/how-to-start-seeds/5062.html
After your seedlings are six to eight weeks old, you can transplant them into larger pots with a coarser growing medium, such as our Transplant Mix. If you wish, you can add up to 20 percent garden soil or sifted compost.
https://www.gardeners.com/how-to/how-to-start-seeds/5062.html
For tomatoes and peppers, you may want to start your plants in a seed-starting system and then pot up to larger containers, such as biodegradable Cowpots. Some gardeners always plant their seeds in little rows in a larger flat.
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During the vegetative phase your plants will establish a solid root system and full leaf development to prepare them for the final flowering phase, the actual marijuana buds. Marijuana will stay in the vegetative growth cycle if it is given anywhere between 18 and 24 hours of light per day. The vegetative growth cycle is usually only two to four weeks long in most indoor strains and will be completed in the third to fifth months of growth depending on the marijuana strain and conditions. The marijuana plant can only grow as fast as it can produce energy required for new growth.
http://howtogrowmarijuana.com/marijuana-vegetative-growth-pruning/
Rotate your vegetable plants under the grow lights every week. The light is more intense in the center of the bulb, so it will help your plants grow evenly. 8. Inspect the bulbs in your grow lights every 4 to 6 weeks. 1  Wipe off any dust or dirt that accumulates. 2  Dirty bulbs do not give off as much light as they should.
http://www.wikihow.com/Grow-Vegetables-With-Grow-Lights
4. Make sure the intensity of the light is strong. Vegetable plants do best outdoors in direct sunlight, so create a similar environment with your grow lights. 1  Keep your vegetable plants no more than 10 to 12 inches (25.4 to 30.5 cm) away from the grow lights.
http://www.wikihow.com/Grow-Vegetables-With-Grow-Lights
Your lights should be on from 18-24 hours per day. If you choose less than 24 hours, a timer is highly recommended to keep a regular schedule. A big part of your lighting is capturing the photons that are not directed to your plants.
http://howtogrowmarijuana.com/marijuana-vegetative-growth-pruning/
Insufficient blue will lead to spindly, weak cannabis plants with long internodes (the vertical spacing between branches.). High Pressure Sodium (HPS) lamps generally only have 3-6% of their spectrum in blue which is why they are generally not recommended during the vegging phase.
http://howtogrowmarijuana.com/marijuana-vegetative-growth-pruning/
You may be wondering how to control how your marijuana plant grows during the vegetative stage. Here's your complete guide. I've collected the best marijuana growth control methods for the vegetative stage, and compiled them here for you.
http://www.growweedeasy.com/marijuana-growth-control-vegetative-stage
For more on how to create a customized seed-starting schedule, see When to Start Your Seeds. If you will be growing your seedlings in a greenhouse or a very warm room, you should subtract at least a week from the recommended planting date.
https://www.gardeners.com/how-to/how-to-start-seeds/5062.html
how long to leave light on new veg plants
Leave lights for 4 to 6 weeks on new veg plants. Leave the light for 4 to 6 weeks on a new vegetable plant. You should leave 4 to 6 weeks light on new veg plants.