Our ocotillos greened out fine this spring. We had lots of rain in June and very little lately. They are now losing their leaves.

Question

Why. This is the first year in 6 years this has happened.

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Answer 1

Apparently this plant gains and loses leaves fairly often during the year. An unusual amount of rain in the winter could have affected its cycles. My suggestion is to remove all the dead leaves and make sure it isn't sitting in wet soil. It should begin to bear new leaves with minimal watering.

https://www.gardeningknowhow.com/ornamental/cacti-succulents/ocotillo/ocotillo-plant.htm