Did you know that if you grow jalepeno peppers near bell peppers, they will cross pollinate. Makes for some nice spicy bell peppers!!
The first time I planted a large garden I planted hot cherry peppers next to the habaneros, not thinking about the cross pollination of the hots to the hots.......the sweet bells were far, far away.
This was a very large garden, a joint effort by a half dozen couples. I was working in the kitchen making pickles one day when some of the guys came in with buckets of the various hot peppers. I grabbed one of the cherrypeppers, as I have always been able to eat them..........not those.
YIKES.
When I plant hot peppers, I put them in the area of the garden least impacted by the wind, and start by putting the habaneros in the most protected part, and then go down according to the heat of each, with jalapenos furthest away.