Tropical Milkweed vs. Native Milkweed

Variegated Fritillary on Tropical Milkweed(Asclepias curassavica)
It is postulated that tropical milkweed may increase a certain type of parasitic infection in Monarchs and interferes with their migration. What should a gardener do?
The best option is to use native milkweed which naturally dies back in cooler weather thus encouraging migration and minimizing parasitic spores.
However, if growing tropical milkweed you could consider cutting it back twice a year with the second cut in October to minimize spore counts on the leaves and prevent Monarchs from overwintering on your tropical milkweed.

https://texasbutterflyranch.com/2021/02/22/tropical-milkweed-impact-on-monarch-butterflies-vastly-overblownsays-longtime-butterfly-researcher/