Tom, I think the cool weather does make some difference, although my peppers this year seem pretty much as hot as ever -- especially judging from the hot bananas and Garden Salsa. I actually didn't think poblanos had much heat to begin with... although I haven't grown them in a long time so maybe I've just forgotten... I have a variety called "Biggie Chili" that is really large and has just a medium kind of heat that I was thinking would make good rellenos (if I ever get inspired to go to that much trouble
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