Does limited underground water storage make plants less susceptible to drought?

Source: ScienceDaily

By tracking water flow through different environments in California, researchers have discovered a secret to the surprising resilience of Mediterranean plant communities during drought years. These plants do well during droughts because they are adapted to living with limited underground water storage even in very wet years. Rock moisture, or lack of it, is the key, and may help predict the fate of other California plant communities in the face of climate change.

https://www.sciencedaily.com/releases/2019/06/190624140357.htm