Look what I found in a particularly weedy part of my garden: the first Monarch caterpillar I've seen a very very VERY long time.
I found that chubby little fellow lurking on a blade of grass so I moved him to this leaf, where he lay like a slug for quite a long time. Then I saw that he'd done a neat u-turn. Then I saw he'd eaten a patch of the leaf and taken off like a maniac. No idea where went. Looked everywhere. So I assume he's out there.
Let your milkweed grow.