If you love cactus, then you have to visit Lotusland in Montecito. They have the most spectacular cactus area I have ever seen, donated by Merritt Dunlap in 1999. His entire collection was carefully moved to Lotusland so it could be enjoyed after his death. One can spend 30 min – 1 hr just walking through the cactus.
There are some photos of it here, mixed in with the rest of the photos of the grounds, but it really doesn’t do the cactus collection justice. You have to see it to believe it.
