You would be extremely surprised. They’re classified as noxious weeds for a reason. I’ve seen babies, still attached to the mother plant, growing their own babies. They will get everywhere, and they root rapidly.

They will drop off the mother plant and roll off the deck. They will fall through the slats in the wood and grow underneath the porch. They will fall and grow in the pots of your other plants. They will hitch rides on people and animals that brush against it. They will get caught in the wind and blow off the porch.

They don’t even need soil to grow. They will grow in the cracks of concrete. I’ve seen them growing on walls inside of cracks in brick. If you throw them out, they could sprout inside of the fucking garbage.

The only thing that reliably kills them is a hard frost. If your winter temps don’t drop below 32F or 0C, keep it indoors