If replacing parsley cuttings and cleaning out water bottles every five days becomes a burden, another option is to purchase potted parsley, dill, or fennel and place in a 10 gallon glass terrarium next to a window.

However, I would recommend placing a screen cage on top of the glass terrarium in order to prevent the greenhouse effect from overheating your glass terrarium. (You don't want to cook your caterpillars.) Or, you could just leave the terrarium open if caterpillar-feeding spiders are not a concern.