Sociability refers to the nature of grouping of individual plants, that is, whether they grow singly, in patches, in colonies or evenly intermixed. This is dependent upon the life form and vigor of the plants, habitat conditions, and competitive and other relations between the individuals. Sociability expresses the degree of association between species. The five sociability groups given below are used for rating the sociability of species.
S1 - Plant (stems) found quite separately from each other, thus growing singly
S2 - A groups of 4-6 plants at one place
S3 - Many smaller groups at one place
S4 - Several bigger groups of many plants at one place
S5 - A large group occupying larger area