That is not our plants in the photo (it's at a workshop in CT). I do grow many milkweeds (mostly common, swamp, and tuberosa) which is for nectaring and egglaying... for feeding large numbers of caterpillars, we use a nearby wild patch.
We are lucky to have a good patch by a creek, only about 2k from home. The creek keeps it fairly moist, even with our high temps and drought this summer. Right now, the freshest plants are those that have resprouted from an early summer cutting along the roadside.