According to Siddha medicine, three humors namely vatam, pittam and kapam are responsible for the health of human being and any disturbance in the equilibrium of these humors result in ill health.

Henna
Botanical name: Lawsonia inermis.
Family: Lythraceae.
Origin and Area of cultivation:
It is indigenous to North Africa and South-west Asia. It is grown mostly throughout India, especially in Gujarat, Madhya Pradesh and Rajasthan.
Uses
An orange dye 'Henna' is obtained from the leaves and young shoots of Lawsonia inermis. The principal colouring matter of leaves 'lacosone" is harmless and causes no irritation to the skin.
This dye has long been used to dye skin, hair and finger nails.
It is used for colouring leather, for the tails of horses and in hair-dyes.

Cotton is one of the oldest cultivated crops of the world. It has been cultivated for about 8000 years both in new world and in old world. Commercial cotton comes from four cotton species: two from the new world and two from the old world.
(1) Gossypium hirsutum
(2) G.barbadense are the New world species and
(3) G. arboretum
(4) G. herbaceum are the old world species.
In India, cotton is cultivated in Gujarat, Maharashtra, Andhra Pradesh and Tamil Nadu.

Botanical name: Vigna radiata
Origin and Area of cultivation: Green gram is a native of India and the earliest archaeological evidences are found in the state of Maharashtra.
It is cultivated in the states of Madhya Pradesh, Karnataka and Tamil Nadu.
Uses
It can be used as roasted, cooked and sprouted pulse. Green gram is one of the ingredients of pongal, a popular breakfast dish in Tamil Nadu. Fried dehulled and broken or whole green gram is used as popular snack. The flour is traditionally used as a cosmetic, especially for the skin.