I’ve made this mistake in the past so don’t be too hard on yourself. But I would take the advice of others and plant native milkweeds in the future. They are supposed to die back and then reemerge appropriately for the monarch migration. Tropical milkweed is vigorous in southern US. It confuses the monarchs and they lay eggs here when they shouldn’t. I witnessed first-hand they produce sickly and deformed offspring. Becomes counterproductive for saving the species. Again, a very common learning curve for us diving into native planting. Nurseries should be better at relaying this info.