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20F is a limiting factor, and will limit you to the temperate Drosera: D rotundifolia, D. intermedia, D. filiformis ssp. filiformis, D. filiformis ssp, tracyi, D. anglica and D. linearis - and possibly the Northern range form of D. capillaris.
In the 100f range, when it does get up there for you, i'd think about a little shade during the day, or at the very least, do not let them dry out at all. Keep water in the tray when that hits ya.
You can also grow D. capensis, D. x obovata, and D. filiformis x 'California Sunset'. I have grown these species outdoors for a few years (except the x obovata) and all have survived temperatures down to 18 F.
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