It all depends on whether the plants like cooler or warmer conditions. Spinach and lettuce I'd think want to be cooler, squash, tomatoes, green beans, okra, melons, corn, stuff like that probably wants it a bit warmer, but I don't think any like temps over 85° of 90°.

--Ron

Thanks, Ron. It appears that they survived the day I had them in the 'hot' window. Your answer makes a lot of sense. I was also thinking that they are more of a greenhouse type container while in the baggie in the window, so I've determined that it's probably just too hot there. My lettuce is the only one that appears it might not survive the torture it underwent in the hot window so far.

~Angela