Kyla, be aware that "organic" plants may also have pesticides on them. As a person who raises caterpillars, I have to be careful with all plants. This is because the BT spray that is used to kill caterpillars is an organic pesticide. BT is the short name for Bacillus thuringiensis, a naturally occurring bacteria that kills caterpillars. So a nursery could say they only use "organic" methods of pesticide, you buy the host plant, and it kills all your caterpillars.
Pyrethrins are also a class of insecticides that are derived from the seemingly harmless Chrysanthemum plant. Not sure if these get advertised as organic or not, but they could be.
Frankly, I'm always a little suspicious of host plants that don't have caterpillars or eggs on them. Or at least evidence of chewing. Some growers will grow these plants in covered greenhouses so they may say that's why there's not caterpillars and such. I've just found that my favorite nurseries are the ones where the caterpillars are happily munching away. Plus, I get bonus caterpillars to bring home! It's not as easy to tell with nectar plants, of course, but there's my two cents. Hope I helped add something to the discussion.
