You are correct, partially. Artificial ground blind are allowed use at any time, as long as they meet the PGC guidelines. Blinds made of natural stuff are unlawful in TURKEY seasons only. This is a result, I believe, or a few cases of accidental deaths in turkey season because of mistaken identity. (Grosse Negligence if you ask me). You must still meet the orange requirement, even if you are sitting in a blind. My suggestion is take an extra hat or vest and post it near you location so other hunters know where you are.