Allium giganteum

If you receive the bulbs before the weather is suitable for planting, store them in a cool, dry, and well-ventilated place. A paper bag or an open crate in a darker corner of a garage or cellar is ideal. This will prevent premature sprouting or, conversely, rotting of the bulbs before they go into the soil permanently.

The bulbs of this ornamental onion are planted in the autumn, ideally during the months of September, October, and November. It is important to plant them at the correct depth, which should be approximately 15 cm. The recommended planting spacing is 25 to 30 cm apart, which corresponds to roughly 9 to 15 bulbs per square meter. As a customer, you will receive huge, healthy bulbs (our largest bulbs size 18/20), which you simply place into a prepared hole with the tip facing upwards and cover with soil. Cultivation from seeds is not done in this case; everything grows from the planted bulbs.

This is a true giant among ornamental onions. It typically reaches an impressive height of 100 to 150 cm. It blooms during the months of May and June, producing huge spherical inflorescences composed of thousands of tiny star-shaped flowers on a long, bare stem. The flowers come in magnificent shades of purple, pink, lilac, and light violet, and contrast stunningly with the unique grey-green foliage at the base.

Although Allium giganteum is primarily planted and grown as an impressive ornamental perennial for its magnificent flowers, the entire plant is theoretically edible and has a mild scent and taste reminiscent of real garlic. However, keep one very important warning in mind: for pets, especially dogs and cats, all plants from the Allium genus (onions and garlics) are highly toxic. Please keep them out of their reach if your pets have a tendency to chew on garden plants.

Definitely yes. The huge violet and pinkish heads, packed with hundreds of tiny flowers, are literally a living magnet for bees, bumblebees, hoverflies, and butterflies. By planting this unmissable ornamental onion, you will significantly support the local biodiversity in your own garden and reliably provide useful insect pollinators with an exceptionally rich and high-quality source of sweet nectar and pollen.

Certainly! The enormous violet spherical inflorescences are absolutely ideal for cutting into tall vases, where they remain fresh and beautiful for quite a long time. At the same time, this popular type of onion is also excellent for drying for indoor winter floral arrangements. Even if you let the flowers dry directly in the flowerbed, they will maintain their compact shape very well and add a highly attractive visual element to the dormant garden.

Great news for all enthusiastic gardeners is that the Allium giganteum is practically entirely pest and disease free. The plant itself is quite aromatic, which naturally repels aphids, hungry slugs, and browsing wildlife. You can therefore grow it without any worries, even in gardens with a history of these common pests.

Absolutely! This majestic species of ornamental onion is highly regarded for its amazing longevity and absolute ease of care, which is why it is recommended by experts as very suitable for beginners. If you provide it with well-draining soil, a sunny spot with full sun in the autumn, and plant the healthy bulbs you received at a depth of 15 cm, it will reward you in the spring with its stunning purple flowers with almost zero additional effort on your part.

Allium giganteum loves full sun. Therefore, choose the sunniest and warmest spot in your garden for it. As for the soil, it prefers sandy, loamy, and, above all, perfectly permeable soil. It fundamentally dislikes waterlogging, so steer clear of heavy, clayey, and permanently wet soils where the large bulbs could rot very quickly.

Yes, growing in spacious ornamental containers is theoretically possible, but it requires a precise procedure. The chosen container must first and foremost be sufficiently deep (ideally at least 30 to 40 cm) so that the large purchased bulbs can be safely planted at the prescribed 15 cm depth, while still having enough room below for their massive root system. It is absolutely essential to create high-quality, functional drainage using gravel or expanded clay at the bottom of the pot, and then use an airy substrate with a significant addition of regular sand. Additionally, in winter, we strongly recommend wrapping the entire pot thoroughly with suitable insulating material, as severe frost affects a pot more dangerously from multiple sides than a standard deep garden bed in the ground.

You are doing nothing wrong; this is not a cultivation error on your part. It is an entirely natural process. The grey-green leaves of all large ornamental onions begin to gradually dry out, turn yellow, and die back just as the plant focuses all its stored energy into forming that huge final flower on its tall stem. A great practical tip from gardeners is to plant lower, dense ground-cover perennials (such as lady's mantle, hostas, or lavender) just in front of the onion, which will mercifully and effectively hide these unsightly drying leaves.

Allium giganteum propagates best over several years in a garden bed through natural and gentle bulb division. Over time, the large mother bulb gradually produces smaller daughter bulbs around its perimeter. Roughly once every 3 to 4 years, you can very carefully dig up the entire clump of bulbs in late summer (after the leaves have completely yellowed and died back) using garden forks. You can then simply snap the daughter bulbs off the main one by hand, clean them, and immediately replant them at a depth of 15 cm in new, chosen sunny spots in the garden. This way, you will get plenty of beautiful new plants completely for free.