(This is why planting foliage plants around them is important.) If not then remove and bin!. Cultivation. Although they aren’t high maintenance, they do have some specific requirements. Plant in groups of three or more for best effect. Do not cut back the browning allium leaves until fall, that is how they store energy for flowers the next season. Allium Giant 'Gladiator' Ornamental Onion . In addition to the globe-shaped blooms, many varieties of allium are tall, growing over 4′ when mature. Allium Gladiator blooms are pleasantly fragrant and this plant is an easy and prolific addition to the garden. Our Favorite Allium Varieties. What Are Ornamental Alliums? In addition to these garden-worthy types, there are dozens of other species that are native to North America. Many varieties of allium have a strong geometric shape. Plus, butterflies and other pollinators love alliums and will visit the landscape in large numbers. If it is a worthwhile plant then you can plant the baby bulbs and grow them on. 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. Some Alliums are devils for forming bulbs on the old flowering stems. Photo by ‘Gardener’s Supply‘. 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 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. The most commonly available are Allium cernuum (nodding onion), A. stellatum (prairie onion), A. unifolium (American garlic) and A. amplectens (narrowleaf onion). Ornamental or flowering alliums are part of the Allium genus, members of the Amaryllidaceae family that includes garlic, leeks, and onions.. They have an undeniable charm, and those balloon like blooms are a great conversation piece. Allium 'Gladiator' (Allium 'Gladiator') will reach a height of 1.5m and a spread of 0.5m after 2-5 years. The flowers are large round and purple, growing 6-8" in diameter, in late Spring to Early Summer. The seed heads look like tiny (2 mm across or so) three cornered green hats. For extra flair, plant shorter-stemmed blooms in from of the leafless stalks of Gladiator. Each one contains three little black seeds.. Grow in fertile, but well-drained soil. Note that some alliums have made their way onto noxious weed lists as they can self-sow prolifically. 1 bulb per bag. They spread like that and some of them SPREAD!. 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. Gladiator – A giant variety. Alliums make wonderful cut flowers. The normal bloom time is midsummer, so you won’t see any flowers until then. 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. 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 … 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. Architectural, Cottage/Informal, Flower Arranging, Beds and borders, Gravel. 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