A Complete Guide to Harvesting, Storing and Growing Allium giganteum Seeds

Allium giganteum, also called giant onion, has a very unusual flower shape and blooms brilliantly. Allium giganteum can be grown in the south, but the results are only average, mainly shown in a short flowering period, poor reblooming the second year, and bulb rot. So how are Allium giganteum seeds harvested and stored? What growing methods are there? Let's take a look together below.

1. How are Allium giganteum seeds harvested and stored?

In summer when there is a lot of rain, the seeds begin to mature in late July at the height of summer, and can be picked. Place the seeds in a cool, dry place. Because they are to be sown in autumn, they must first be stored in a low-temperature environment. They can be kept in the crisper drawer of the refrigerator, with the temperature controlled at around 6°C, and by autumn they are ready for sowing.

2. What growing methods are there for Allium giganteum?

1. Seed propagation

After the seeds of Allium giganteum mature in early July, collect them and dry them in the shade, store them at a low temperature of 5-7°C, sow them in autumn in September-October, and they will germinate and emerge in March of the following year. In summer the above-ground part also withers, forming small bulbs, and seedlings take about 5 years of cultivation before they can flower.

2. Division propagation

Bulb division propagation is carried out in summer and autumn. Peel off the daughter bulbs around the main bulb, and choose a sandy loam site with a low water table, good drainage, and loose, fertile soil as the growing site. Each mother bulb can be divided into 1-3 small bulbs, among which the larger bulbs can flower in the second year after planting.

3. Seedling-stage management

Allium giganteum is a type of flower with an extremely low natural multiplication rate of bulbs, but if the flower scape is removed as early as possible after it appears, so that nutrients are concentrated on the development of the renewal bulb and daughter bulbs, the number of small bulbs can be appropriately increased. In summer the above-ground part dies back, and the bulbs can be dug out, separated by size, and placed in a ventilated spot to pass the summer.

Allium giganteum is planted after autumn. Those with bulbs reaching more than 3 cm can flower after planting, while those smaller than 3 cm need to be grown for one more year before they can flower. Bulb multiplication rate: Allium giganteum likes a cool, sunny environment and requires loose, fertile sandy loam. It dislikes waterlogging and is suitable for cultivation in northern China.

The above is an introduction to Allium giganteum. When propagated by seed, Allium giganteum will sprout in the spring of the second year, but it must be cultivated for 5 years before it can flower. Division propagation is carried out in summer and autumn, and generally it can flower in the second year after planting. Everyone can choose a suitable propagation method for growing seedlings.

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