I have noted the jalapenos peppers from Safeway in recent times are far less heat than years ago. My brother says they are deliberately breeding some of the heat out.
I use habaneros and serranos for heat now, and jalapenos stand in for recipes that want green bell peppers.
Peppers are subject to soil nutrients.
Jalapenos are really easy to grow in a pot.
If you use Miracle Grow, they will be hot! HOT! HOT!..............