Explanation:

Tea grows best in tropical and sub-tropical climate which offers warm, moist and frost free conditions.
The rainfall should be evenly distributed throughout the year to ensure continuous growth of tender leaves.
The soil should be rich in humus and organic matter and should be well drained. There should not be any stagnation of water in the tea plantations.
Tea plantations are labour intensive and require cheap and skilled labour.
It is due to these climatic requirements that tea grows better in the north eastern region of India than the northern states of Himachal, Uttarakhand etc. (Assam and West Bengal together account for 75% of total tea production of India)