Ocotilos

Question

How long do they live, and how do you tell if it is dead?

Answer 1

Ocotillo can live up to 100 years.
If the roots die, say from root rot, it can take months for the entire plant to die.

Here is an article that has more information.

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