Water is made of 2 hydrogen and 1 oxygen molecule. Plants can grow in water as long as the part where a leaf grows is under water because that is where roots will grow best. The growth of roots is influenced by where the water source is. Water culture is when you place a plant in water and expect it to grow. The water culture is one of the main types of the hydroponic gardening method.
All plants have a certain climate that they grow best.
The best climate for the plant Peperomia is medium light and fairly dry soil. Many plants can grow roots on a cutting. Some examples might be Pothas, Grape Ivy, Wandering Jew, and Peperomia. In order for plants to grow hydroponically, a leaf must have been cut off of the original shoot. Where leafs were or where leafs were trying to grow is the part that must be under water because that is where roots grow.