Consumers appreciate onions in all kinds of cooking. Onions can be grown in Sweden with good results. Onions can be stored for a long period. There is a potential to increase the self-sufficiency in onions. To achieve this, a better knowledge of long-term-storage potential indicator factors that are easy for the grower to analyse at the time of harvest is needed. Through this project, the growers will get access to easy-to-use analysis tools based on scientific results. Soil analyses, plant analyses and content of sugars and bioactive compounds will be analysed in laboratories. Easy-to-use methods for analysis of total sugars, glucose, calcium, nitrate, pH and hardness will be used in parallel and will be correlated with the laboratory results and weather data. When the growers already at the point of harvest can decide which onions to sell immediately and which to store for longer time, the quality out of the storage will be improved. The result is reduced waste and better economy.