A swallowtail laid eggs on mine at least once; I found the caterpillars.
Unfortunately, something else did to, and apparently it ate them.
This last time I got eggs (I don't know what eggs, because I thought the
swallowtails that use this as a host plant laid their eggs spread out
over the plant, not in a cluster), but they disappeared one by one and I
never found a caterpillar. I think the swallowtail that uses Sweet
Bay as a host plant lays single eggs here and there, so I'm not even
sure what eggs these were. Next time the eggs go INSIDE to hatch!
Hopefully next time will be soon. I'll update this page when and if
there is, or when I get a better photo of the whole tree (it's a bit
small right now.)