We have some white swamp milkweed (Asclepias incarnata ‘Ice Ballet’) in a frequently wet part of the lawn. It bloomed for a nice, ling time this summer and as it gets more established I expect it to do even better. Yesterday Cathy noticed a caterpillar on it and I took some photos. I took a few more today. This is a monarch caterpillar (Danaus plexippus). Although I generally don’t encourage insects that eat the leaves on our plants, I make an exception for these little guys. We really enjoy the monarchs in our yard and so we put up with the feeding habits of their young.