Umm, some corrections required to the last post. Do NOT use soil, use compost - compost & soil are 2 totally different things, compost is a growing medium for pots, with more minerals & nutrients than soil, because plants growing outdoors in soil have root systems that cover tens of square feet, while root size is limited in pots - general all-purpose potting compost is fine, John Innes #3 is probably the best non-organic compost for herb. Don't pot in large pots, pot in small pots & repot once the roots start to show through the drainage holes at the bottom of the pot - this allows the root system to make the most of the limited pot space, to give a compact root ball. Always use fertilizer, the compost, although having more nutrients than soil, still doesn't have enough, and if you don't fertilize (any houseplant fertilizer will do for vegging, and tomato fertilizer for flowering - use the directions on the packet - you may also need magnesium, herb goes Mg deficient very easily, but a teaspoon of epsom salts in a litre of water a couple of times during the grow will sort that). Use more than 'a little fan' - the most important thing for herb (or any plant) after light & water is carbon dioxide - if you don't have a decent extractor fan to remove 'used' air & pull in fresh, your plants won't give you anything like their full yield. If you like couch lock, don't harvest until most of the trichomes have gone amber - that shows that the THC is converting to CBD - the chemical in herb that acts as a sedative. Don't switch to 12/12 until the branches begin to alternate (not form opposite each other on the stem) - the plant is not fully mature til then - again, this will affect yield. When drying, 2-3 weeks is more realistic, not 2-3 days (don't force dry, use heat, or a fan - this makes the herb harsh), then put the bud in airtight jars for another 2-3 weeks at least - this is called curing, and is essential for a good smoke (most commercial bud is cut too early & not cured, which is why it can be a twitchy, paranoid high - properly matured & cured herb is relaxing & smooth, not pokey & harsh)