Margaret's mallow 2.0
I agree. My native garden is doing OK with supplemental water (I have some less than one year and one year old installed plants).
The source of Margaret's mallow (Lavatera assurgentiflora) was some seed from a neighbor of mine when I lived in Hawthorne. Their mother or grandmother had brought the original seed back from a trip to the Channel Islands. The plants are short lived, but have beautiful flowers and of course they enjoy the climate here, just a short distance from the island where they are from.