Parsley is subject to the larvae of the monarch butterfly, a
striped caterpillar.

Just to be a bit nit-picky--monarch butterfly larvae feed almost exclusively
on plants in the milkweed family. The striped caterpillar commonly seem on
parsley (and dill) is the larvae of swallowtail butterflies. My solution is
to just plant extra parsley. I appreciate having the butterflies around!

Cheers,
Sue

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Zone 6, South-central PA