I was curious since I have tried the Japanese Camellia, but always had trouble with spider mite.
The bare bones: Camellia sinensis. Half-hardy evergreen shrub. Needs acid, lime-free soil. Propagate by seed in early spring or late summer cuttings in sandy peat in a close frame. (Our flowering camellias are the species japonica and its many selected cultivars and crosses).
Needs protection from wind and a shady place. [In England] "excellent for shady places and for walls with north aspect."
Scarify seed (hole in outer coat and plant 1/2 inch deep in rich soil, pH 4.5-5.5, in gallon pots, soil moist (not soaked), part shade, germination 6-8 weeks, decrease moisture somewhat after germination. Hardy to 20 degrees F. Protect from wind.
All teas, green, black, etc., and no matter where grown, come from cultivars of this one species.
Own observation of Camellia (flowering)- should have temperature drop at night. Spider mites a problem esp. if temp. too high- protection from wind does NOT mean keep in a closed environment, good air circulation absolutely necessary. That is why it should be grown outdoors unless one has a good ventilation system in the greenhouse (very difficult where winters are very cold like they are where I live).
Supposed to be OK in US plant zones 7-9. Grows 4-6 feet high.
Nice photo and a few directions at tea plant