So very sorry about the invasives taking over your property.

Regarding the Honeyvine, Monarchs will lay eggs on Honeyvine and the little cats can grow to adulthood on it. Mama Monarchs will use other varieties of milkweed more frequently, at least here in my garden. This vine will spread by underground roots and of course by the seed dispersing on the wind. I grow it in a big pot. Occasionally, I see a tiny sprout on the ground nearby where a root has escaped the big pot but I pull it and that seems to keep it pretty much contained to the pot. I originally grew it to have as backup food. It is a hardy vine. Even when I neglect it, it still returns each year. Surprisingly, I have never seen a seed pod on it.

Concerning the invasives, I know the feeling of dispair as we had thorny blackberry vines to contend with. I don't know if they originally came from a neighbor or were planted by the prior owner or by a bird but they spread everywhere by underground runners. After many battles with them, I finally bought a small container of Brush Killer, put on double protective gloves, poured some Brush Killer into a disposable container, dipped cotton balls in the liquid, then put one cotton ball on top of each freshly cut vine stub, put a plastic sandwich bag over the cotton ball and secured tightly with a rubber band. The covered cotton ball allowed the brush killer to remain on the stub, where the brush killer was drawn down into the runners and roots. That eradicated those awful spreading vines without damaging anything else. I had tried to cut them down, dig them out, etc. and nothing worked. They were coming up in my garden beds and even in my lawn. I liked this method as there was no over spray, nothing getting out into the air or into my lungs and nothing getting against the poison, as it was covered tightly with the plastic bag. If you ever get a hankering to go after a few of those unwanted plants, you might consider giving this a try. You can work at it as time permits as the preparations are simple. Nothing gave me such satisfaction as to see those horrible thorny vines die and wither away.

Thank you for growing milkweed for the Monarchs.

Mary