It is a widely known (I hope) fact that Monarch Butterflies are in danger due to Milkweed annihilation. Letting Milkweed grow is a wonderful conscious step to remedy this problem. Milkweed makes pretty flowers and usually grows away from the garden in a flower bed or in a field as a weed.
Swallowtail butterfly, on the other hand, unlike the Monarch, feeds on the plants we actually cultivate in the garden: dill, parsley, carrots, rue etc. This is a significant difference, because this makes the Swallowtail butterfly caterpillar a garden pest. And even though most gardeners know that butterflies are beneficial pollinators, as well as pretty to look at, dealing with their caterpillar damage may be frustrating. The problem worsens due to the fact that gardeners often do not identify the caterpillars correctly and simply destroy them.
Swallowtail butterflies start as little, individually laid pearl-shaped eggs, which turn into little spiky brown-black caterpillars with one white stripe, resembling bird droppings. The caterpillars shed their skin a few times and are most often seen in a green/black striped garb with yellow dots. They have little orange horns that pop out when threatened, which release a very stinky odor. In a few weeks of feeding, the caterpillars make a cocoon and in a few more weeks – butterflies emerge.
We have been raising Swallowtail butterflies for a few years now and release dozens of them out into the wild. We would like to encourage people to think Pet, not Pest. You can have your dill and let the butterfly caterpillars eat it too!
The easiest solution is to plant some extra dill/parsley away from the garden or on the side and let the caterpillars feed on their own patch. This will protect your main crop, but won’t protect the caterpillars, which often vanish in our garden due to high population of wild birds… So to save both, your garden plants and the caterpillars, a caterpillar farm is the answer. It is so incredibly easy to make and is fun, educational and beneficial to your garden!