not from what stinky told me it is not to high, i was told to get it towards 6.8 as she said 6.5 is to low for a soil grow. i have read the flush sticky many times and it contradicts what i was told to do as far as what is a good ph to use. here is my other thread i had where i was told this. http://boards.cannabis.com/plant-pro...eaf-viens.html