Propagate Hydrangeas Easily Multiply your hydrangeas in just a few easy steps: 1 Choose a green non-flowering stem, 1015 cm long with 23 nodes. 2 Cut just below a node and remove the lower leaves. 3 Optional Dip in rooting hormone. 4 Plant in moist, well-draining soil. 5 Cover with a plastic bag to keep humidity in. 6 Place in bright, indirect light and keep soil moist. Roots should form in 24 weeks! Then transplant into a pot or garden. Simple, cost-effective, and perfect for gifts or expanding your garden!