I freeze my seeds prior to germination and it works for me. By no means am I an expert grower, I'm on my first growth with high powered lights... I fill the ice tray, put one seed in each slot of my ice tray, in my case the ice tray has 14 cube slots.. and then I freeze them over night, thaw them for a day and then plant into a peat pot with soil. All 10 of my first plants came out female.