Propagating a Monstera in water is a simple way to turn one healthy stem into a new plant. Success begins with the right cutting: it must include a stem node, not just a leaf and petiole.
Look for a healthy section of stem with at least one leaf and one node. The node is the slightly swollen ring or bump where a leaf and aerial root emerge. A leaf without a node may stay green in water, but it cannot produce a complete new plant.
Clean the blades, then cut the stem about 1 to 2 inches below a node. Remove any small leaf that would otherwise sit underwater. Keep the main leaf above the waterline.
Set the cutting in a clean jar so the node and any aerial root are submerged. Do not immerse the leaf or most of the petiole, as constantly wet foliage can encourage rot.
Place the jar in bright, indirect light, away from harsh direct sun. Replace the water about once a week, or sooner if it becomes cloudy. Rinse the jar gently each time.
New roots may appear gradually. Pot the cutting when several roots are roughly 2 to 4 inches long and smaller secondary roots have started to branch. Use an airy, well-draining houseplant mix.
Water the soil thoroughly after planting and keep it lightly moist during the first couple of weeks. Some temporary drooping can occur while water-grown roots adjust to soil, but avoid leaving the pot waterlogged.
To propagate Monstera in water, start with a cutting that includes a node, keep that node in clean water and provide bright indirect light. Once the roots are established and branching, move the cutting to soil for continued growth.