Usually, chrysanthemum plants are found to propagate naturally and found spreading in the entire area. Which method of propagation does it depict? Can they be propagated by any other artificial methods?

Explanation

### Step-by-Step Solution:

1. **Identify the Natural Propagation Method**:
- Chrysanthemum plants propagate naturally through a method known as vegetative propagation. Specifically, they spread through underground stems, which are called rhizomes. These rhizomes grow horizontally under the soil and can give rise to new shoots that emerge above the ground.

2. **Explain the Process of Natural Propagation**:
- The underground stems (rhizomes) of chrysanthemum plants grow and develop new shoots. As these shoots mature, they can separate from the parent plant and establish themselves as new plants. This method allows the chrysanthemum to spread across a wide area naturally.

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