I have a wide sandy boulevard in direct sunlight most of the day. I tried for 35 years without any success to grow lawn here. No amount of watering or choice of grass type made any difference. It had to be a cold-hardy grass for 4 foot deep frost in the winter and also survive summer heat waves. It had to endure sometimes very wet spring or fall seasons and 4 week long hot droughts. When I retired, I decided to solve the problem by looking to weeds as my solution.
First I tried white clover, said to be drought resistant. It certainly outperformed grass; took longer to die but was just as dead! Then I stumbled on bird's foot trefoil. It really was drought tolerant and had beautiful yellow flowers as a bonus. Creeping buttercups followed, then autumn hawkbit, chicory with blue flowers, yarrow with dark pink flowers, hedge bindweed with 30 foot roots and huge pink morning glory flowers, several kinds of daisies, chamomile, knapweed, yellow clover, red clover, alfalfa, Indian strawberries, cinquefoil, violets, and a lot of vetch and so on. All beautiful but still stuff died if I didn't water when the drought came early before enough foliage had grown to shade the ground.
It became clear early on that just picking drought resistant plants was not enough - I was going to have to change the ground from sand to soil. Even before I started with the weeds I had started mulching all my leaves from 3 large maple trees on to this boulevard every fall. Rather than just raking them onto the road and letting the city take them. But the soil was improving only very little. Then I read an article that said: "whatever amount of organic material you think you might need to change sand into soil; well, you need 100 times that amount!" That was a game changer in my efforts. I started collecting all the neighbor's leaves off the road with my mulching lawnmower and saving them in huge plastic bags to use all through the following spring and summer. I started composting all the leaves falling on a 10 car parking lot next door and adding that compost to my boulevard. I figured 1 inch of compost was maybe equivalent to 5 inches of mulched leaves. In the spring when everyone else was raking their lawns clean, I was adding a layer of shredded leaves every couple of weeks or as fast as they disappeared. I have a lot of hedges and all the trimmings were mixed with leaves and strewn on the boulevard. When my maples dropped their keys I scooped up as many as I easily could and, yup, on to the boulevard they went. Later, the row of elms across the street shed an enormous quantity of elm keys/seeds. I shovelled them every day for a week and a half off the road and on to my boulevard.
The same article also said that as much foliage as possible above ground and as much root growth as possible below ground was also important. So now I have a 3 foot high jungle of wildflowers and rapidly improving soil. And amazingly, when I part the foliage and look at the ground, it is wet and the grass is green and lush down there.....
Ray