In this master thesis, the factors influencing the conversion to organic farming in the periurban region of Valencia/Spain were investigated. Barriers and motives for conversion as well as needs for action to develop organic farming were looked at. In the area of research horticulture and permanent crops are prevalent. The inquiry was realized through 30 qualitative Interviews with experts, organic farmers and conventional farmers. The most important barriers for conversion to organic farming were lack of information and public relations on organic farming, problems for the distribution of organic products on the national market, the necessity to export and competition among the organic producers. Other important restraints were lack of political and financial support for organic production, urban encroachment and insufficient economic and organisational structure of the organic sector. Conventional farmers anticipated problems with crop protection. Less frequently mentioned barriers were pesticide drift, the high age of farmers, the competitive mentality among organic farmers and the farm size. Lack of acceptance among the population was mentioned, although experts emphasised the increasing interest in organic production. Personal conviction was important for all organic farmers to convert. Needs for action were mainly seen in the distribution of information and the improvement of commercialization. Measures to reduce the financial risk of conversion as well as changes in political and institutional structures were mentioned as chief requirements for the further development of organic farming. Barriers prevailed and diminished the willingness for conversion to organic farming in the periurban region of Valencia.