Good brief article on the tea plant (uses, folk medicine, toxicity, cultivation, etc., on the Purdue Univ. website, www.hort.purdue.edu/newcrop/duke_energy/Camellia_sinensis.html: Camellia sinensis

Also Univ, Delaware: Camellia sinensis

Someone in the Botany Dept. at your university may have direct experience in your area.