question re: blooming autoflowering

Hi,

My lowriders (autoflowering) just showed sex and I have at least 2 girls for sure, and maybe 2 more. They are about 12 inches tall w/ lots of shoots and bushy. My first question is how long after showing sex before they start budding? Also, I want to add nutrients for blooming and have been unable to find 5-10-5 as suggested. I am considering using bone meal 0-10-0. Has anyone had experience with it? If so, what concentration should I use per gallon of water?

Thanks for any input!

use bone meal and bat guano, it should put your fert mix at around 7-12-5, that should be good.