" I'm in zone 6 where curassavica isn't hardy."

Are you SURE?!

I planted ONE a few years ago. The adult plant will die but it reseeds PROLIFICALLY to the point of it being a WEED..., at least in NJ/Zone 7. Every year, it spreads and plants seem to be getting taller. My native "Swamp" Milkweed never seemed to thrive and I have none now, but the "tropicals" are very, VERY vigorous! Be warned.

subtropix, I meant the plants themselves aren't hardy. I've had them volunteer in spring, but those are new plants. There would only be a couple, wished there were more, definately not to the point of being close to weedy. I don't know if they would grow back from the roots in your zone or not. The warmer the climate the more volunteers people get.

Myrtle, all you need to do is deadhead your plants before they go to seed. You may still have a few plants from seeds in the ground, but eventually you will be rid of them. I wish they vollunteered like that up here.

They aren't weedy for me either but they do self sow and the monarchs love them so much that I wouldn't mind an abundance. Steelhanky, those are pretty big already. You could pinch the tops and they will get bushier. Otherwise, they may get leggy and floppy by next spring.

I think you might need to transplant them at some point this winter. Do you have a hole at the bottom of the cup for drainage? If you do and the roots start coming out, it would be a good time to transplant.

I would plant them in gallon sized pots now if you are planning on growing them under lights all winter. I'm going to start some curassavica under lights around Feb. The plants grow fast as the weather heats up and I want to start them earlier so they have more time to flower. I started curassavica and Gomomphocarpus under lights last year. I got the 2 plants mixed up and when they bloomed I was shocked but also happy that I got to see a Gomohocarpus flower for the first time.

They all started looking a little sickly. I popped the soil out of the cup, indeed rootbound. I upped the pots to quart and half-gallon size, they've all recovered. Also, I lopped a couple of plants in half to propogate. Dropped the tops in water with rooting gel, none have died yet. Some have rooted, I transferred those to potting soil, all looking good.

Good to know you can root milkweed cuttings in water.

You can *definitely* root tropical milkweed cuttings in water. I've dropped 10-15 cuttings the past two months into water, 100% grew roots, and all are doing very well now in soil. Zero have died.