The yuccas are in bloom:

These plants grow exceptionally well in our desert-like climate. They have stiff, fibrous leaves and stout, waxy flowers that protect them from drought and harsh sun.

They are easy to cultivate. The underground base of the plant is like a big, mutant turnip. Chop off a chunk of the stuff (it kind of looks like potato flesh) and plant it. Yuccas will emerge.

Yuccas are agaves and are native to the southern US and Mexico. The famous Joshua Tree of the Mojave desert is Yucca brevifolia. The botanical sub-family that includes all agaves and yuccas is Agavoideae and that in turn is classified as part of Asparagaceae, the asparagus family. Many older references (like Jepson) still list Agavaceae as a separate family

I’m not really sure what species is growing in our yard. I suspect it is either Yucca filamentosa (Thread Yucca or Adam’s Needle) or Yucca flaccida (Weak-Leaf Yucca). It doesn’t matter. They are really neat, low-maintenance plants that have their showy time and that time is now!