When people say "desert" a lot of people assume Arizona, or Nevada. I live in Idaho, and although I'm surrounded by mountains, my growing climate is similar to a desert. Dry, windy, and a below 30% humidity unless it snows. I have mulberry tree growing. My observation is simple. Water. I have a "snake mister" not sprinkler. It mist water. It's actually my secret to growing fig tree in my yard. It gets so dry here, your skin is itchy. My mulberries do very well. I fertilize and water. Truthfully I neglect mine. It does fine