I know that the jalapneos I grow in my central Ontario garden are far hotter than those imported to our local graocery store. I try to grow different varieties (including spicy slice, travellor, early and new for me this year - jalamundos. Since jalapenos can range from 2500 - 8000 on the Scoville (which is actually quite mild compared to many of the hot peppers I grow) perhaps stores are stocking milder varieties to appeal to a broader audience? Apparently my jalamundos can go well over 10,000 SU so I am excited for that crop to mature :)