They are beautiful but have to be careful as plants and sap are toxic. They are easy to grow from seeds. This one I am trying to get seeds but no luck yet.
@Murky has same zone as you and she has desert roses and has 5 months old seedling with buds. She is growing her seedlings using a grow light.
https://garden.org/thread/view...
If you want to try, I donate my extra seeds through Victory Seed Company, since I can't grow them all.