The inflorescence of scallions is large and brightly colored, and its full bloom lasts for nearly 20 days.

Allium grandiflorum

Onions generally refer to large onions

Allium giganteum Regel is a perennial bulbous flower of the genus Allium in the Liliaceae family, with fleshy root bulbs and onion flavor. Leaves tufted, grayish green, long lanceolate, umbels capitate, flowers, fruits and seeds densely inserted on top of flower peduncles, flowers purplish red, long stalked, seeds round, black.

Originated in central Asia, many countries in the world garden have planted. The Netherlands is the main exporter of bulbs. The bulbs were introduced from Holland in Beijing Botanical Garden, Institute of Botany, Chinese Academy of Sciences in 1979.

This species is used as an ornament and beautification for flower borders, rock gardens, or lawns. Big flower onion inflorescences are as large as head, hence the name. Its color purple, colorful, is the highest ornamental value of a genus of plants.

morphological characteristics

Herbs perennial, scape arising from bulb base, leaves sheathed or bare above ground; leaves tufted, gray-green, long lanceolate, entire, 60 cm long, 12 cm wide, 7-12 in 3-4 whorls.

The flowering bulb weighs about 30 grams, is about 3 cm in diameter, and has 80-90 fibrous roots. Flowers, fruits and seeds dense umbels are capitate, attached to the top of the flower, flowers from the leaf cluster out, up to 12.5 cm; inflorescence by 2000-3000 star-shaped flowers, inflorescence as large as the head, diameter up to 18 cm, hence the name. Its color purple, colorful, purple floret, with a long handle, petals 6, was arranged in two rounds.

Fruit bearing, seeds round, black, 1000-grain weight 4.18 g. A single inflorescence can produce 80 mature seeds under natural pollination conditions. Flowering spring, summer.

growth environment

Sexual likes cool sunny environment, avoid damp and rainy, avoid continuous cropping, semi-shade, moderate temperature 15-25℃, loose fertile sandy loam, avoid ponding.

distribution range

Originated in central Asia and the Mediterranean region, there are many plants in gardens around the world. The Netherlands is the main exporter of bulbs. The bulbs were introduced from Holland in Beijing Botanical Garden, Institute of Botany, Chinese Academy of Sciences in 1979.

propagation method

Seed propagation: Allium grandiflorum L. seeds mature in early July, collected and dried in the shade, stored at 5-7℃, sown in autumn from September to October, germinated and emerged in March of the following year. In summer, the upper part also withers, forming small bulbs, and the seedlings need to be cultivated for about 5 years to bloom.

Plant division propagation: bulb division propagation is carried out in summer and autumn, the sub-bulbs around the main bulb are peeled, and the sandy loam with low groundwater level, good drainage, loose and fertile is selected as the cultivation land. Each parent bulb can be divided into 1-3 small balls, and the larger bulb can bloom in the second year after planting.

cultivation techniques

Allium grandiflorum is a kind of flower with very low natural multiplication rate of bulbs, but if the nutrients are removed early after the appearance of scape, the number of small bulbs can be increased appropriately. Summer ground part dies, can dig bulb, big and small bulb separates, buy ventilated place to spend summer.

After autumn planting, bulbs up to 3 cm or more can bloom after planting, less than 3 cm need to cultivate a year to bloom, bulb proliferation rate of onion like cool, sunny environment, loose fertile sandy loam, avoid ponding, suitable for cultivation in northern China.

The open field cultivation of Allium grandiflorum should select sandy loam land with low groundwater level, good drainage, loose and fertile as cultivation land. The planting time should be from mid-late September to early October, the plant spacing is 20×30 cm, and the planting depth is 2-3 times of the height of fresh stem.

After planting, flatten the hole surface slightly, and then water it. It is not necessary to cover the cold in winter. When the leaves emerge in March of the next spring, loosen the soil and water them in time. Water them every 10-15 days with liquid topdressing. Pay attention to cultivation, loosening the soil and weeding. Add a small amount of artificial spray or shade in dry places, which can alleviate the change of leaf yellowing in early summer.

After flowering, the stems and leaves wither. Before the rainy season, dig the bulbs early to avoid decay after rain. Put them in a ventilated and dry place to dry and collect them. Store them in indoor ventilated places. Plant them in September and October. The planting land should not be continuously planted. Pay attention to the application of decomposed organic fertilizer. It rains in summer and needs timely drainage.

bingchong prevention

During the storage process of Allium grandiflorum bulbs, prevent high temperature and high humidity, otherwise it is easy to cause rot disease, keep ventilation and dryness, and soak seeds with 600 times of 60% zinc wettable powder before planting. At the same time, no continuous cropping.

main value

With the floret open and gradually increase the ball of onion, blooming inflorescence diameter up to 20 cm, onion inflorescence large and strange, bright and bright color, plus its full bloom can last nearly 20 days, with ornamental value.

Onion can be planted in flower border, rock or lawn as decoration, can also be used as flower type specific cut flower materials, applied to floral works.