Photo by ‘Gardener’s Supply‘. Do not cut back the browning allium leaves until fall, that is how they store energy for flowers the next season. 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. Each one contains three little black seeds.. Ornamental or flowering alliums are part of the Allium genus, members of the Amaryllidaceae family that includes garlic, leeks, and onions.. 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. Hi Paula – Allium ‘Millenium’ is an herbaceous allium, which means it grows from a clump of roots (like most other perennials) rather than from bulbs (like Gladiator or Purple Sensation). In addition to these garden-worthy types, there are dozens of other species that are native to North America. The most commonly available are Allium cernuum (nodding onion), A. stellatum (prairie onion), A. unifolium (American garlic) and A. amplectens (narrowleaf onion). 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. Architectural, Cottage/Informal, Flower Arranging, Beds and borders, Gravel. Our Favorite Allium Varieties. Cultivation. Gladiator – A giant variety. Allium 'Gladiator' 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 … Some Alliums are devils for forming bulbs on the old flowering stems. Although they aren’t high maintenance, they do have some specific requirements. 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 Allium Giant 'Gladiator' Ornamental Onion . It grows at a medium rate, and under ideal conditions can be expected to live for approximately 5 years. If it is a worthwhile plant then you can plant the baby bulbs and grow them on. (This is why planting foliage plants around them is important.) The flowers are large round and purple, growing 6-8" in diameter, in late Spring to Early Summer. Allium 'Gladiator' (Allium 'Gladiator') will reach a height of 1.5m and a spread of 0.5m after 2-5 years. Note that some alliums have made their way onto noxious weed lists as they can self-sow prolifically. They have an undeniable charm, and those balloon like blooms are a great conversation piece. Plant in groups of three or more for best effect. 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. Many varieties of allium have a strong geometric shape. They naturalize quite well, returning year after year with increased vigor and blooms. Allium Gladiator blooms are pleasantly fragrant and this plant is an easy and prolific addition to the garden. Suggested uses. In addition to the globe-shaped blooms, many varieties of allium are tall, growing over 4′ when mature. If not then remove and bin!. They spread like that and some of them SPREAD!. 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. What Are Ornamental Alliums? 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