Those look like olive trees? Grasses and agaves -- a drought-tolerant alternative to lawn in hot, dry climates. Oehme Van Sweden drought tolerant demonstration garden with grasses and agave at Cornerstone.
Mediterranean Garden, Olive Tree, Bay Area Brandon Tyson Berkeley, CA. The gnarled trunk of a specimen olive tree planted on a raised mound emerges from a meadow of lavender and yucca in a Mediterranean garden in the Bay Area showcased in the Early Spring