Potted onion cultivation in the ecological urban garden

Growing onions in pots in your organic urban garden is worth it: it is not a complex crop, you do not need a lot of space and onions are used in many cooking recipes and even home remedies, so it is very practical to have organic onions on hand.

If you are a beginner in urban horticulture, growing onion in a pot or cultivation table can be a very interesting option to consider because it is not a difficult crop.

We also advise you which organic seeds to use , the best planters, growing boxes and tables for your garden and essential books to learn everything about organic gardening .

The onion, Allium cepa L. , is a biennial bulb horticultural plant native to Asia that belongs to the botanical family Liliaceae, just like aloe vera or aloe , asparagus, garlic or sarsaparilla .

Potted onion cultivation

Sowing and transplanting

You can sow the onion seeds directly or prepare seedlings or seedlings. If you prepare seedbeds , that these have a first layer (at the base) fine sand and the rest we fill with a mixture of organic soil and compost that we will sift or strain well with a fine mesh to avoid pieces of earth that hinder germination and the development of the first roots. If you sow directly , leave a distance between seed and seed of about 10 to 20 cm², depending on whether the variety of onion you grow is more or less large.

The temperature that best favors the germination of the seeds is between 20 and 23 ºC. Also try to keep the seeds with a certain degree of humidity, but without overdoing it.

If you have prepared seedbeds, at 7 or 9 weeks the seedlings can be transplanted to their final place of growth.

Look at the growing calendars when to plant onions .

plant onions Flowerpot or container

The most important thing to look for when growing onions in pots or cultivation table is that it is between 25 and 30 cm deep.


It is important that the substrate is not caked, it must be loose and without clods of earth so as not to hinder the development of the bulb. It is important that the substrate has good water drainage capacity.

As an example for a 30 cm deep pot, you can put a first layer at the bottom of the pot with some large stones, on top another layer of sand (in total we would have already covered 5 cm) and the rest (25 cm) we can Fill with a mixture of 1 part humus to 3 organic soil or 1 part compost to 3 organic soil.

Look at the crop association table


Onion is one of those crops that needs us to regulate irrigation very well. It can be very sensitive to lack of watering or irregular watering and we will notice it because the onions have cracks. On the other hand, constant excess water can cause bulb rot.


For best yields, try to place your onions in a space where they can receive direct light. Although it can adapt to semi-shady areas, it is preferable to place the onions in a sunny place.


There are different varieties of onions that are very well adapted to different types of climate. In fact, there are onions that can be grown during all seasons of the year, enduring winters and summers without too much trouble.

Plagues and diseases

Thrips, nematodes, the beetle, the moth, and the onion fly are the most common pests. This type of crop can also be affected by fungi such as mildew and rust. Luckily, we can prevent and fight pests and diseases in an ecological way, see here .


As I said at the beginning of the article, the onion is a biennial plant, this means that during the first year the bulb develops and during the second year is when the flowers appear with the seeds. If you want you can harvest the onions the first year but if you want to save the seeds to sow onions in future seasons you can leave a plant that ends its life cycle until the flowers come out, they dry and you can get the seeds. All this will happen during the second year of cultivation.

To harvest the onions, you will know that they are ready because the leaves tend to dry out and about 4 months will have passed since they were sown. When you harvest the onions, you can leave them in the sun for another day or two so that they finish drying and do not have excess moisture.


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