welcome
6.5 - 7 i just read it from the faqs at the top also read fox farm big bloom is very stable as far as ph is concerned
im gonna be using this also
They reccomend 6.3-6.8 And here's a fox farm feeding schedule for soil.>>>http://www.foxfarmfertilizer.com/soilfeed.pdf Do exactly what they tell you, and you will have some bad ass plants in the end.