Which one of the following is not a natural method of vegetative propagation

Options

A. Runner
B. Foliar buds
C. Stem tuber
D. Grafting.

Answer

To determine which of the following is not a natural method of vegetative propagation, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Vegetative Propagation**:
- Vegetative propagation is a form of asexual reproduction in plants where new individuals arise from vegetative parts such as roots, stems, and leaves, without the formation of seeds or spores.

2. **Analyzing the Options**:
- **Option A: Runner**:
- Runners are horizontal stems that grow along the ground and can produce new plants at nodes. This is a natural method of vegetative propagation.
- **Option B: Foliar Bud**:
- Foliar buds are buds that develop on leaves and can give rise to new plants. This is also a natural method of vegetative propagation.
- **Option C: Stem Tuber**:
- Stem tubers, like potatoes, are swollen parts of a stem that store nutrients and can sprout into new plants. This is a natural method of vegetative propagation.
- **Option D: Grafting**:
- Grafting is a horticultural technique that involves joining parts from two different plants so they grow as one. This method is artificial and not a natural method of vegetative propagation.

3. **Conclusion**:
- Based on the analysis, the option that is not a natural method of vegetative propagation is **Option D: Grafting**.

### Final Answer:
**D. Grafting**

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