Found these two new babies yesterday. Based on my research, these are called Euphorbia milii, otherwise known as Crown of Thorns.
Euphorbia milii is a species of flowering plant in the spurge family. It originally came from Madagascar. It can grow up to 2 feet in height. For limited garden spaces like mine, pruning off the growing tips may control plants height.
transferred into green pots
How to propagate? Take 3 inches stem cuttings in spring or summer. Dip the cut ends in warm water for a few minutes to stop the flow of sap then allow to dry for 24 hours before inserting into barely moist potting mix. Cuttings will root in about 6 weeks.
Caution: Wear thick gloves when handling this plant because thorns are sharp and toxic. Its milky sap can irritate you skin, eyes, and mouth.
Source: Guide to House Plants