how do u know if u have nitrogen burn?

[tybo29]

i bought 3 different stains from the disp. grand daddy, cronic, and lemon purp. for about two weeks they all were doing fine. then i gave some fertilizer to them two days later only the lemon purp started to wilt, anyone have any clues?

[GetThisOrDie]

You should fill out the troubleshooting form that is a sticky in the plant problems sections. Also post it there and you will have better look getting a diagnosis from people.

Pics help alot as well.