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My brush cherry (I think that's it's ID anyway) is dying. It's leaves dry up and shrivel up and new leaves turn black and curl into themselves. I've tried increasing its water, spraying it with water, and increasing its sun exposure. I use distilled water, I don't know what else to do...Help! Is it sick? Or just lacking some component of care?

If you are in the northern hemisphere. Get it outdoors to experience the natural environment.