Useful plants can be categorised on the basis of their use and products provided as:
1. Food plants: Plants that provide cereals, pulses, vegetables, fruits, sugar, tea, coffee, spices.
2. Fibre plants: Cotton, jute, coconut (coir).
3. Timber plants: Deodar, pine, teak, sal, shisham, bamboo.
4. Medicinal plants: Datura, Cinchona, isabgol, neem. Rauwolfia.
5. Oil-yielding plants: Castor, coconut, mustard, sunflower.
6. Ornamental plants: Orchids, cacti, rose, dahlia, croton, chrysanthemum.
7. Other useful plants: Rubber-yielding plants, dye plants, gum and resin yielding plants.
