Hello, Amrutha!

Here is the list of Important subjects for Horticulture:

1. Pomology - scientific study of fruits
2. Olericulture- scientific study of vegetables
3. Floriculture and Landscape Science - Flower production
4. Plantation Science
5. Spices Production
6. Medical and Aromatic Crop Production
7. Post Harvest Management
8. Plant Propagation Methods

All the best!

Hope this helps!