Ordered supernova from AMS in February 2012 and received them in late March 2012. Out of 10 of them three sprouted, got to one inch, looked deformed and died. They looked OLD and the quality looked bad. They will not respond. Their affiliates will not respond. It was almost a total bust...
I agree with Shrubs First. If you checked the ph and tempature to be within the proper range then the uptake of the nutrients should be okay. Then you consider the amount of watering or if your nutrients are out of balance. They make a test kit for soil for NPK that will tell you the range...