you might be right on the over fertilizing. I use miricle grow every other watering can and water about every 3 days or so. I just went out and got a bud inhancer (0.13.14) that says to use once and then nothing for 3 weeks. I am not sure if i have 3 weeks left. As for the age of the plant i am not sure when i started it but i did leave it veging to long.