Yes, dahlias will overwinter in warmish years (and do in areas like the Pacific Northwest with some regularity…more reliably in warmer zones). Swan Island Dahlias, a choice big producer, has some advice: http://www.dahlias.com/index.asp?PageAction=Custom&ID=2 As for the caladiums, they are a little trickier in my experience. I think I may not have a spot that’s the right temperature/humidity combination, and also fear I have not cured the dug tubers thoroughly enough before putting them in peat or vermiculite in 50-ish degree dormancy. By "cure" I mean letting them air dry for two or three weeks before stashing them in a medium for the winter. Purdue University explains it (and also how to store all such tender bulbs and bulb-like creatures) in this PDF. http://www.hort.purdue.edu/ext/HO-085.pdf
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.