I find it remarkable the range of climates apples are grown in. Sure, some thrive in cold climates and are able to withstand frigid winters like Honeycrisp and others do well in the tropics like Dorsett Golden, but some like Wealthy do well in both. Many of the Russian imports to North America in the 1870's such as Red Astrachan and Yellow Transparent do well in "low chill" environments also and can really take the heat. But I find that in keeping with the adaptability apples show in other areas like pruning and rootstocks. Apples are easily trained to just about any shape or size, and will fruit merrily along just about wherever you grow it, from a "stepover" espalier a foot off the ground to a big bushy shade tree. The range of dwarfing rootstocks is also remarkable, more than all other tree fruits combined. Apples are also quite forgiving when trying to graft them, and seem to look for any excuse for the graft to take. I also watch a tree adapt to the climate after it's been planted. When we first plant a Fuji apple, it will keep the leaves until April. Each year it will lose them a little earlier until after about 5 years it drops them by New Years, leaving the still-firm apples hanging another month. That's why we've planted the hundred or so of varieties we have, hoping to draw out some of these qualities that are locked inside the apple. I just wish we had more room to plant a lot of seedlings also, as some apple core tossed aside may contain the genetic traits of the next Wealthy or Dorsett Golden.