In a dark, warm, humid place. Folks can have good results using heating pads under humidity domes ... but you have to get it just right, or you'r making boiled beans. cn
I got 9 out of 10 to pop. I threw them in a glass of water for 20 hours, then planted them in some pre-soaked rooting cubes and walla. I am the proud papa of some lovely young White Widow ladies.