I grew a nebula plant from seed bought from a popular dealer. Everything at first glance turned out great and in perfect color, height, size, big buds with lots of good looking tricomes. After drying it, there is no potency at all. I've tried oil as well as smoking it. It was harvested after 60% of the buds had turned amber and the tricomes were turning milk colored. This was grown pretty much by the book. This would make sense if the plan't looked bad but it looked great. What can cause a plant to have no potency at all?