Your climate is just too hot for too long for a Japanese maple to thrive. Some folks try the standard types with broader leaves (as opposed to the types with finely cut foliage) a bit south of their zones with some success by providing soil with lots of compost or peat mixed in, a very bright shade and consistently moist but well drained soil conditions. If you choose to try a Japanese maple these are the conditions that would give it the best chance of survival.
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