good rule rule of thumb is when they get a foot tall or 12 inches it all really depends on how much bud you want the bigger they get the more potenial they have to produce bigger buds but at about a foot you should get a a ounce or two depending on the growing condtions/skillmy plants are 5 weeks old (but look like they're 3) how long should i let them veg before i start to flower them. right now they're on an 18/6 light cycle. when should i put them to 12/12?
easy as pieflip the light to 12/12 that easy