What is the difference between Japanese Green Tea and other green teas?

All (non- herb) tea comes from the same plant. It is said that tea was brought from China to Japan by Buddhist monks as a medicinal beverage.

The way Japanese green tea differs from other green teas is in the process after
The leaves have been picked.

Soil and climate conditions vary from country to country and how is process once it is picked.
The Japanese do approximately three pickings and then various gradins.
Small leaves picked in early spring are prized for their energy and flavour. Later season leaves do not command the same price or demand.

Since is still discovering many of the benefits of the tea.

The anti-oxidant property of green tea is what excites researchers most. Other claims are that it helps control blood pressure lower blood sugar levels, and that it even retards the ageing process.

Firstly remember; " CHA" means tea in Japanese:

• Kukicha is made from the twig of the tea bush. The twigs are sorted and roasted in Iron cauldrons. The result is a unique flavoured tea that is low in caffeine.
  
  
• Sencha is Green Tea. Green tea comes in many grades; specialist graders are used to sort the teas from the various plantations. Sencha is often considered 'guest tea' because one only serves guests good quality.
  
  
• Hojicha is roasted green tea. Selected leaves are lightly roasted giving a deep almost smokey flavour. Hojicha makes a pleasant summer tea when served cold.
  
  
• Genmai cha is Green tea with roasted brown rice. The appearance of the popped rice against the Green tea gives an interesting appearance. Genmaicha may be served hot or cold and has slightly nutty flavour.