How can you have grass & tree landscaping in a very dry environment AND be ecologically responsible?
If it is contrary to what is native for your area, it is NOT ecologically sound. You are contravening the environment and sometimes that is necessary for your well being. Just don’t do something that affects the land beyond your boundaries. Border your garden with Bougainvillea or other dense foliage flowering shrubs to protect it from drying out in the wind. It also protects your garden from prying eyes who don’t understand, or would snitch your flowers. Then go to the local garden shops and see what they offer for your area. Don’t be afraid to experiment with new plants. If they don’t grow, you will be no worse off than you are now. Drip irrigation for lawns will not work in the desert unless you are wanting only a 6 inch circle of grass around the emitter. Drip will work well for shrubs and flowers in a small circle.