Cut a 4- to 6-inch section from the growing end of a vine. Make the cut 1/4-inch above a leaf node for best results.
Remove all foliage in the bottom 2 to 4 inches of the cutting, leaving at least two leaves on the vine.
Place the cutting in a vase or glass of water so that all leaves remain above the water level. Foliage decays and contaminates the water quickly if submerged.
Set the vase in a sunny window where it receives bright, indirect light. Direct sunlight heats the water quickly and may injure the stem or developing roots.
Check the water daily for any signs of stagnation. Change the water if it becomes cloudy or begins to smell. Otherwise, refill the vase daily to replace the water that evaporates.
Pot the cuttings in individual pots once roots are 2 to 3 inches long. Roots may appear within a few days, but may take a week or more, depending on the water temperature and the specific cuttings.