Preparation of the soil and seeds
The soil for sowing onions should be loose and not freshly fertilized, as onions are poor consumers and react to over-fertilization with growth problems and diseases. It is important that the beds are thoroughly cleared of weeds, otherwise the young plants will not grow. For the sowing in spring the soil should be covered with organic as early as autumn fertilizer to be dug up. Later with potash at most fertilize, e.g. B. with wood ash.
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In the case of seeds purchased from specialist retailers, it can usually be assumed that they will germinate well. In the case of seeds that you have harvested yourself, it is advisable to check whether they will germinate before sowing. To do this, the seeds are placed in a glass with water, the healthy seeds sink to the bottom while the "empty" seeds remain on the surface. If you want, you can use a seed bath with Humofix before sowing.
The sowing
The right one time depends on the weather. Since the onions germinate at very low temperatures, sowing can be carried out as early as February. However, the floor should be sufficiently dry. Usually this is the case in late March-early April. The onion seeds can also be grown in the greenhouse, Cold frame or moved forward in a cool, bright room and later moved outdoors.
- Seed depth about 1 cm
- Row spacing approx. 20-25 cm
- isolated depending on the variety to 5-10 cm
- Germination temperature 15-18 ° C
- Germination time 3-4 weeks
Tips & Tricks
Given the relatively long germination time of the onion, it can be helpful to mark the rows with the onion seeds together with fast-germinating seeds, e.g. B. Sowing lettuce or radishes. It is also easier to identify and remove weed competition in the beds.