Nowadays, there are a number of citizens engaged in the community greenings by various kinds of flowers on an individual basis as well as on a group basis. In the case of Sapporo city, the municipal government supports both individuals and groups. In this study, we conducted the questionnaire survey with citizens, engaged in community greening in Sapporo city, to reveal the attitudes shown by two types of participants; one is on an individual basis and the other is both on an individual and a group basis. As a results, it appeared that there were some differences in the motivations between these two types of participants. More particularly, those engaged on an individual basis have much stronger motivations for "recreating themselves" and "growing flowers" than those engaged both on an individual and a group basis. On the other hand, both these two types of participants faced technical problems in horticultural areas. In addition, we found that about 60% of participants who engaged on an individual basis were willing to grow flowers in public spaces. In order to promote these activities more effectively, it is important to take advantage of coalitions across these two types of participants.