Joshua tree itself is in bloom, a rare and spectacular event that doesn’t happen every year. What is even more interesting about this phenomenon is that it’s synchronized. The bloom happens in the same year, at about the same time throughout the desert areas.

https://www.flowersociety.org/jt_botanical.htm Botanical relationships: The Joshua Tree (Yucca brevifolia) is the largest of the Yucca species. Often considered part of the Agave family (Agavaceae), or grouped with Agave (Century Plant) in the Lily family (Liliaceae), the Joshua Tree has the same linear, sharply pointed leaves as Agaves and other Yuccas. The species name brevifolia describes the shortness of the leaves. Joshua Tree differs from other Yucca not only in its size and longevity (well over 500 years), but also in their irregular growth patterns (described previously).