'burning' ... over-fertilized, nitrogen burn ... if you are using any kind of soil with nutrients already in it, do NOT fertilize until the plant is in flower ... don't panic, all you have to do is 'flush' the plant ... pour 2-3 times the capacity of the pot, room temperature water, let it drain well ... when you DO add ferts, use them at 1/2 strength, and only once a week, if needed ... and, don't overwater, let the soil dry between waterings ...:smokin: