Can you propagate a Monstera in water?

Yes, water propagation works well for Monstera and is a popular method because it is simple and you can watch the roots form. Water roots are different from soil roots, so the move to soil needs a little care, but Monstera cuttings usually adapt.

Taking the cutting: find a node, the slightly thickened ring on the stem where a leaf joins and where small brown aerial root bumps often appear. The cutting needs at least one node, because that is where new roots grow. Cut just below the node with clean, sharp scissors or pruners. A section that already has an aerial root tends to root faster.

In water: stand the cutting in a clear jar of room-temperature water with the node submerged and the leaf above the water, in bright indirect light. Refresh the water regularly, every few days. Roots usually appear within a few weeks; wait until they are a few inches long before potting up.

Moving to soil: use a well-draining aroid mix and keep it lightly moist (not soggy) for the first couple of weeks while the roots adjust, then go back to normal watering. The mother plant usually pushes new growth from a node near the cut.