Yucca. ("yucca rostrata et bougainvillier." From Chrome research: "Yucca is a genus of perennial shrubs and trees in the family Asparagaceae, subfamily Agavoideae. Its 40-50 species are notable for their rosettes of evergreen, tough, sword-shaped leaves and large terminal panicles of white or whitish flowers. Wikipedia."
In the pictured front yard, the sturdy trunks of California fan palm (Washingtonia filifera) anchor the space. The landscape is studded with Agave ‘Sharkskin’, feathery Yucca rostrata, and golden barrel cactus. The tall Mexican fan palms, Washingtonia robusta, were preexisting on the property.