Chrysalis Tree - Balboa Park
A butterfly garden is nestled within Zoro Garden in Balboa Park (kind of like those Russian nesting dolls - a park within a park, within a park). They've planted a bunch of butterfly-friendly plants - it's a joy to sit there and have butterflies flit around you. To complete the butterfly effect, they've even interwoven some branches to make a little chrysalis tree. Although, I didn't see any chrysali on it - do the butterflies know this is where they're supposed to transform? Here's the official page for Zoro Garden.