I know what some people are going to say but i have grown all of my plants in Miracle grow potting soil. in my buckets i used a diluted fertilizer mixture of 10-10-10 solution. until the plants really started to come into season then i switched over to a 15-30-15 solution. you are supposed to mix 1 tablespoon of fertilizer per gallon and i did 1 tablespoon per 3 gallons.
I haven't let the jalapenos get ripe yet i have been picking them while they were still green.
As far as the cross pollinating my friend couldn't remember if there was anything by it.
Thanks for the info.