One advantage that I've heard of, at least for hybridizers who live in an area that is very hot, is that you can move the ones that you want to hybridize into a cooler spot in the shade, and then put them back out in the garden later in the day, or the next morning. Supposedly, you may have better luck getting seeds to set that way. I haven't tested this myself, but I'd love to know if anyone has tried that and if it worked better.
