Not really. Some strains are just slower than others. It's been a while, but if I remember right, the first time I grew this Forbidden Fruit that I've got going it took almost 3 weeks before I saw preflowers on some of the plants. And one of the plants never did flower. I chopped it during the fourth week of 12/12. Figured it was probably defective anyway, and I needed the extra room for my other plants.