David Ross in :

In the
summer, it gets watered perhaps 3-4 times.

yeah, the cvs we have in CA are hardier than the driest cvs, so they're native to areas that get at least 5" rain during the months
CA gets at most .5"precip. (iirc from researching this years ago)

http://www.mediterraneangardensociet...ficinalis.html has some info.