How to propagate Allium giganteum (giant onion)? Mastering these propagation key points is enough
Allium giganteum is a perennial herbaceous plant, widely cultivated in northern China, and is one of the varieties used for decorating and beautifying flower borders, rock gardens or lawn edges. Cultivating Allium giganteum artificially is not difficult, and artificial propagation of Allium giganteum can be done by sowing and division.
Allium giganteum
I. Seed propagation
Seeds mature in early July, are dried in the shade, and stored at a low temperature of 5-7°C. Sow in autumn from September to October, and they germinate and emerge in March of the following year. In summer the aboveground parts also wither, forming small bulbs; seedling plants require about 5 years of cultivation before they can bloom.
II. Division propagation
In mid-September, peel off the daughter bulbs around the main bulb and plant them. In mid-September, peel off the daughter bulbs around the main bulb and choose sandy loam soil with a low groundwater table, good drainage, and a loose, fertile texture as the cultivation site. Bulb division propagation is carried out in summer and autumn; each mother bulb can be divided into 1-3 small bulbs, among which the larger bulbs can bloom in the second year after planting.
Key points for cultivating Allium giganteum
Allium giganteum has brilliant flower colors, a peculiar flower shape, is simple to manage, and rarely suffers from pests and diseases. It is a variety used for decorating and beautifying flower borders, rock gardens or lawn edges. Allium giganteum is also known as giant onion and huge onion. It belongs to the Liliaceae family and the genus Allium.Origin and habits: Allium giganteum is native to Central Asia and the Mediterranean region. It prefers cool conditions and sunshine; it requires loose, fertile, well-drained sandy loam soil.
Morphological characteristics: Allium giganteum is a perennial herb, with a plant height of 50-110 cm. It has bulbs, and the bulbs have a white membranous skin. The leaves are basal and broadly strap-shaped. The flower scape is cylindrical, and numerous small flowers are densely gathered into a spherical umbel, 10-15 cm in diameter, pink to light ultraviolet in color, with capsules; the flowering period is May to June.
Propagation techniques: Allium giganteum is mainly propagated by sowing and by bulb division. Sowing propagation is mostly done by direct sowing in the open field in September; the suitable germination temperature is 10-15°C, and after sowing, cover with 1.5 cm of soil, and they germinate the following spring. It takes 3-4 years before they can bloom. When propagating by bulb division, after the mother bulb blooms it often splits into 2-3 daughter bulbs, which can simply be separated and planted. Management techniques: The cultivation site for Allium giganteum should be applied with fully decomposed organic fertilizer, plus an appropriate amount of phosphorus and potassium fertilizer as a base fertilizer. When planting, cover the bulbs with about 15 cm of soil, with a plant spacing of about 35 cm. After planting, water once every 2-3 weeks, and water once more with freezing water before winter begins. After the soil surface dries, loosen the soil once. After emergence the following spring, strengthen water management until flowering. Ornamental value: Allium giganteum is an important ornamental flower in countries around the world. The flower stems are tall and sturdy, and the large spherical inflorescence is extremely spectacular, standing out uniquely among flowers. It is mostly planted in rows along flower borders or in clumps in front of shrubs or on lawns. It is also a popular cut flower material.
How to plant Allium giganteum? Planting and management techniques for Allium giganteum
Allium giganteum is a common ornamental plant in landscaping. Its flower stems are tall and straight, its flower colors are vivid, and its spherical flowers are even more distinctive, giving it high ornamental value. So, how do you plant Allium giganteum? The planting and management techniques for Allium giganteum are introduced below.
Image: Allium giganteum
I. Planting methods for Allium giganteum
1. Propagation of 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 in autumn from September to October, and they germinate and emerge in March of the following year. In summer the aboveground parts also wither, forming small bulbs; seedling plants require about 5 years of cultivation before they can bloom; (2) Division propagation. Bulb division propagation is carried out in summer and autumn. Peel off the daughter bulbs around the main bulb, and choose sandy loam soil with a low groundwater table, good drainage, and a loose, fertile texture as the cultivation site. Each mother bulb can be divided into 1-3 small bulbs, among which the larger bulbs can bloom in the second year after planting.
2. Allium giganteum is a flower with an extremely low natural bulb multiplication rate, 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 aboveground parts die off, and the bulbs can be dug out, separated by size, and placed in a ventilated place to spend the summer.
3. Allium giganteum is planted after autumn. Those with bulbs reaching more than 3 cm can bloom after planting, while those smaller than 3 cm need to be grown for one more year before they can bloom. Bulb multiplication rate: Allium giganteum prefers a cool, sunny environment and requires loose, fertile sandy loam soil; it dislikes waterlogging and is suitable for cultivation in northern China.
Image: Allium giganteum
4. For open-field cultivation of Allium giganteum, choose sandy loam land with a low groundwater table, good drainage, and a loose, fertile texture as the cultivation site. The suitable time for planting bulbs is from mid-to-late September to early October, with a plant and row spacing of 20×30 cm, and the planting depth is such that the soil covering the bulbs is 2-3 times the height of the fresh bulb.
5. After planting Allium giganteum, press the surface of the hole slightly flat, then water. In winter, there is no need to cover for cold protection. In March of the following spring, when the leaves emerge from the soil, loosen the soil and water in time, and with liquid topdressing, water once every 10-15 days. Pay attention to intertillage, loosening the soil, and weeding. In places with dry air, appropriately add a small amount of artificial misting or shading, which can ease the yellowing of leaves in early summer.
6. After flowering, the stems and leaves of Allium giganteum wither. Dig up the bulbs early before the rainy season arrives, so as to avoid rotting after rain. Place them in a ventilated, dry place to dry, then store them, spread out in a ventilated indoor place, and wait until September-October to plant. The planting site should not be continuously cropped, and care should be taken to apply decomposed organic fertilizer. Summers are rainy, so drainage must be timely. Allium giganteum gets its name because of its huge inflorescence.
Image: Allium giganteum
II. Key management points for Allium giganteum
1. Soil:The growth of Allium giganteum requires loose, fertile sandy soil, and good drainage.
2. Light and temperature:Allium giganteum likes a growing environment with plenty of sunshine and does not like semi-shade. The suitable temperature for growth is between 15°C and 25°C, and it relatively prefers cool conditions. In winter, generally not many cold protection measures are needed. In summer, the aboveground parts of Allium giganteum will die off, and the underground bulbs can be dug out and stored in a ventilated place.
3. Watering and fertilizing:Allium giganteum needs good water and fertilizer management, and watering should be carried out in combination with fertilizing. During the growth period of Allium giganteum, the soil needs to be loosened and watered in time, generally fertilizing once every 2 to 3 weeks, applying some thin liquid fertilizer, and watering along with fertilizing. In summer when temperatures are high and the air is dry, air humidity can be increased through shading or misting. When it is rainy, drainage must be timely to avoid waterlogging and bulb rot.
[Editor's concluding remarks]Allium giganteum dislikes damp heat and excessive rain, continuous cropping, semi-shade, and waterlogging, and special attention must be paid to these during care. The above has introduced the planting and management techniques for Allium giganteum, and I hope it can be helpful to everyone!