To solve the problem, we need to identify the method of plant propagation in which two stems are joined to grow as one plant.
1. Understanding Grafting:
Grafting is a horticultural technique where tissues of plants are joined so that they continue their growth together. It is commonly used to propagate fruit trees and ornamental plants.
- The scion (a stem from the desired plant) is joined to the stock (the rooted plant).
- Over time, they fuse and grow as one single plant.
2. Elimination of Other Options:
- Layering: Involves bending a stem to the ground to encourage roots to form while still attached to the parent plant.
- Cutting: A method where a piece of plant is cut and planted to grow independently.
- Conjugation: A type of sexual reproduction in microorganisms, not related to plants.
Final Answer:
The process of joining two stems to grow as a single plant is $ \text{Grafting} $