Succulents can be easily propagated with the use of a single leaf removed from the plant, allowed to callous over for a day or more, and then placed back onto moist potting mix to start rooting/develop new growth.
You can also propagate succulents by placing plastic wrap over the opening of a glass vessel filled with water secured with a rubber band. A small hole can be poke so the end of the leaf is hovering over the water (not touching it).
Overtime you’ll see roots starting to form growing toward the water where it can then be planted into soil.
- You can remove a single leaf off a ZZ plant, or make a clean horizontal cut on a snake plant leaf, let them callous for a day, and then place the cut end into water (not the entire leaf).
Examples of plants that can be propagated with just a leaf include most succulents like Echeveria, Hoyas, Sedum, Sempervivum, as well as Snake plants, ZZ plants, African violets, Begonia rex, Kalanchoe, etc.
Other plants like Ficus or Monstera can be propagated with a single leaf as long as you have a part of the main stem attached that will contain meristematic tissue which helps new growth develop. Otherwise, if you just use a leaf without a part of the stem for these plants roots may grow but no new growth.