Suggested uses. Some Alliums are devils for forming bulbs on the old flowering stems. Cultivation. Architectural, Cottage/Informal, Flower Arranging, Beds and borders, Gravel. Each one contains three little black seeds.. They spread like that and some of them SPREAD!. Many varieties of allium have a strong geometric shape. Gladiator Ornamental Onion will grow to be about 14 inches tall at maturity extending to 4 feet tall with the flowers, with a spread of 15 inches. Although they aren’t high maintenance, they do have some specific requirements. Let’s jump in. 1 bulb per bag. Tall varieties of allium such as Summer Drummer Allium, White Giant Allium, Allium giganteum, and Gladiator Allium are best planted in the back of a planting area. (This is why planting foliage plants around them is important.) Alliums make wonderful cut flowers. Spread: 1' - 2' (30cm - 60cm) Allium 'Gladiator' (Ornamental Onion) Award-winner Allium 'Gladiator' is one of the tallest and most architectural onions with its inflorescence consisting of dozens of small star-shaped reddish-purple flowers forming a 6 inches across (15 cm) globe-shaped cluster. In addition to these garden-worthy types, there are dozens of other species that are native to North America. Our Favorite Allium Varieties. The seed heads look like tiny (2 mm across or so) three cornered green hats. Gladiator – A giant variety. Plant in groups of three or more for best effect. Allium Gladiator blooms are pleasantly fragrant and this plant is an easy and prolific addition to the garden. Grow in fertile, but well-drained soil. Plus, butterflies and other pollinators love alliums and will visit the landscape in large numbers. Large flowering allium, such as Gladiator are best planted in groups of 3 or 5, you can plant 3 bulbs per square foot for the best affect. Photo by ‘Gardener’s Supply‘. In addition to the globe-shaped blooms, many varieties of allium are tall, growing over 4′ when mature. If it is a worthwhile plant then you can plant the baby bulbs and grow them on. The flowers are large round and purple, growing 6-8" in diameter, in late Spring to Early Summer. Learn how to make a beautiful bouquet with them in this helpful post The Starring Ingredient of a Stunning Bouquet by Slow Flowers with Debra Prinzing.In her post, she shares a step-by-step guide on how to take fresh-from-the-field flowers and put them into a … Allium 'Gladiator' Ornamental or flowering alliums are part of the Allium genus, members of the Amaryllidaceae family that includes garlic, leeks, and onions.. Allium Giant 'Gladiator' Ornamental Onion . If not then remove and bin!. What Are Ornamental Alliums? It grows at a medium rate, and under ideal conditions can be expected to live for approximately 5 years. They naturalize quite well, returning year after year with increased vigor and blooms. Allium 'Gladiator' (Allium 'Gladiator') will reach a height of 1.5m and a spread of 0.5m after 2-5 years. Allium Gladiator - Common name:Ornamental Onion - Large dense blooms of fuchsia, lilac and amethyst flowers the size of a softball, bloom atop 3-5' leafless stems. Allium bulbs are splendid for naturalizing if planted in rich, well drained soil Scent keeps deer, rodents & rabbits at a distance Beloved by bees, butterflies & pollinators » Massive 8-10" globe shaped flowers » Blooms in Late Spring - Early Summer They have an undeniable charm, and those balloon like blooms are a great conversation piece. Note that some alliums have made their way onto noxious weed lists as they can self-sow prolifically. The normal bloom time is midsummer, so you won’t see any flowers until then. For extra flair, plant shorter-stemmed blooms in from of the leafless stalks of Gladiator. 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