I bought this plant from Colonial Creek Farm a couple of years ago, along with several other fragrant sages. Most were tropical or semi-tropicals, but this was reported to be hardy to zone 8. My garden straddles zone 7b/8a, so I wasn’t sure about it. It did return, though, even with a couple of serious cold snaps last winter.
Leaves are fragrant and there is a resinous taste, like a hint of pine mixed with mint and fruit. Salvia microphylla is reported to be edible, but some salvias are quite poisonous (Salvia divinorum and Salvia coccinea are two), so I err on the side of caution. I might use the pretty flowers to decorate something, but I wouldn’t eat many.
I learned from the Plant Delights website that Wild Watermelon was introduced in 1996 after being discovered as a seedling at the Strybing Arboretum (now known as the San Francisco Botanical Garden). Plant Delights notes that it is hardy to at least zone 7a, which makes me a little less worried about it surviving here over the long term.
My plant grows in part sun to a little over two feet by two feet. No doubt it would flower more with more sun, but the fragrant leaves are abundant in this situation. I consider the bright pink dots that bloom occasionally a bonus.