1) With the plants introduced from Paraguay and those raised at Izu from the seeds of Paraguay origin, studies on the growth and stevioside content of Stevia rebaudiana were carried out.
2) Although the plant showed active growth under relatively high temperature conditions, it also tended to considerably be resistant to cold, and seemed to winter over in warmer districts with seldom frost even in Japan.
3) Stevioside was found to be richest in the leaves, and very little in the stem. About 6% of stevioside was seen in the leaves harvested at Izu, whereas a leaf sample of Paraguay origin showed 7.6% stevioside.