anyone who thinks u can impact the outcome of the sex of a plant is wrong...think of it this way...genes are in the seed before its a plant, it is a male or a female right then and there it doesnt BECOME male or female.....so stressing the plant is just going to give you a crappier plant and make it hard to tell which male is the one to use...what you need to do is grow the reg beans to the best of your ability and YOU WILL get a male, thats life. pop 5 and u will get at least one male, most likely ofcourse, but you want to grow em all the best you can so you can see which is the strong good male to use in breeding