I always have milkweed in my own garden and also volunteer
in a local butterfly house where we grow milkweed inside to
feed the caterpillars of our Monarchs. Inside the covered
butterfly house where there is no natural predation, we do
get so many caterpillars that they can completely denude the
plants. We usually move a lot of them outside to other
milkweed plants. However, outside, the plants never get
that denuded and we do not see nearly as many caterpillars
on the plants. I believe that outside, the eggs are more
likely to get eaten and the caterpillars are eaten by birds
and attacked by wasps and some just wander away.
I guess I would just wait and see how many caterpillars
actually appear on your plants. It is most likely that your
plants will be somewhat eaten on but not too badly.
A long time grower of a number of varieties of milkweed.
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