(c) Effect of clone and agronomic practice The greater importance of leaf constituents in determining the character of green tea means that the effect of clone and agro- nomic practice are greater than with black tea. Catechin and amino acid content vary according to clone and there are also differences in the ratio of I-theanine to other amino acids, such as Larginine. Variation in the content of glucosides Cand thus monoterpene alcohols) are responsible for clonal differences in the flowery notes of green tea. The relative quantities of linalool and geraniol are of particular significance and the ratio is often defined using the terpene index: