The largest grower of teas is China, closely followed by India.
India
I believe the answer to your question is China.
tea
3rd in annual production (after China & India). However, Kenya is #1 in the amount of tea exported.
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olive tea
Sugandh Tea is known to be probably India's best quality and most liked tea. It is manufactured by Sugandh Tea Pvt. Ltd is an Indian non-alcoholic Best tea brand in India.
Oliveto tea
oliveto olive tea
The best tea in India is above the Himalaya mountain.
The contribution in the GDP of India from the tea industry is quite proportionate. There are 1692 registered tea manufacturers and 2200 registered tea exporters.