Onions start to germinate at temperatures as low as 2-3 degrees Celsius and withstand light frost temperatures. Therefore you can begin to sow onions in the open in February. The earth should be fine and loose, not too heavy and loamy. So that the bulb grows very large and healthy, the seed must be planted in a loose bed not more than one centimetre deep. After germination of the seeds, the superfluous seed buds must be transplanted so that the remaining onion plants each have approximately 30 x 30 centimetres space each. Regularly clear the onion beds of weeds by constantly loosening the earth by thorough hoeing. Some onion varieties flower from June to July. As soon as inflorescences can be seen on onions, these should be removed so that nutrients get into the bulbs and the plant does not use these to develop seeds. The harvest can begin from June to September. It is a good time for the harvest when the onion leaves begin to become dry and withered. The harvested onions are then stored free of frost and well dried, for example in the sun.
Onions have various healing powers. As early as the Middle Ages, people used the onion as a seasoning and healing plant. Used externally, an onion cut in half helps against insect bites. In naturopathy, the onion is used for respiratory diseases, against coughs and colds. However, the onion is also effective in the digestive tract, for example it alleviates gastro-intestinal complaints.