Depending on the height of the allium, tall alliums look great at the back of a border and small varieties are well-suited for containers. Planting Alliums in Pots and Containers. Giant Allium (Allium giganteum) is the tallest of the large flowering allium with 4"-6" diameter, ball-shaped flowers.The Giant Allium adds a wonderful element to a garden and will even catch the eye of the non-gardeners! This will assure sturdy stems so flowers will be less likely to flop. Bees love it. Plant the bulbs at a depth of roughly 3 … Depending on species and variety, they may grow in U.S. Department of Agriculture plant hardiness zones 3 through 10. It blooms with eight-inch violet-purple flowers atop 12 to 18-inch stalks. Among the last of the perennials to bloom, its flowers often don't open until late September or October. The large A. giganteum, aka giant allium, grows up to four feet tall with six to eight-inch purple blooms. Allium giganteum is planted in fall more or less 4 to 5 inches (10 to 12 cm) deep in light soil. For the most productive display of blooms, plant alliums in full sun. Alliums (Allium spp.) Soil must be light and drain well, and even poor soil is fine. Another late-bloomer that flowers in autumn. Alliums are relatively easy to grow from seed, although germination can be lengthy depending on the variety you are planting. Alliums are not great grown all by themsleves as their leaves are fading and look relatively unattractive just as the flowers open. If it is 2 inches (5 cm) tall, plant … Shooting up to 6 feet tall, they have gray-green leaves and bear big, round, deep purple flowerheads 5 to 10 inches across. No reason why not. Some of the giant varieties can benefit by being planted near a wall or fence for some protection from strong winds, so you won't have to worry about your stunning blooms snapping in a storm. A good tip to know how deep to plant it is to multiply the height of the bulb by 3. Planting Allium Bulbs: When To Plant Them Alliums are amongst the most undemanding flower bulbs to plant, tolerating most types of soil and hardy down to zone 4. These huge flowers blossom the size of softballs with a gorgeous purple color and sway atop sturdy stems in late spring. The best allium to grow in pots is A. karataviense. Just make sure the pot is deep and fairly large and the compost is kept moist in the growing season. A. cristophii, commonly known as star of Persia, is the parent of several ornamental allium favorites. They hate waterlogged soil. span a broad range of garden favorites from ornamental bulbs to kitchen-garden essentials most cooks can't be without. Planting in the ground. Allium loves high sun exposure. The other thing to think about is underplanting. These may be planted at any time during the growing season. Planting allium. Surely the biggest is the aptly called giant onion, A. giganteum. Alliums will grow perfectly well in a well-drained soil. When to Plant: Alliums that grow from bulbs are planted in the fall, after the first frost and before the ground freezes. They should be planted in fall between September and November, before the soil freezes. Varieties like the star of Persia (allium christophii) and giant allium (allium hollandicum) produce distinctive globe-shaped lilac-purple flowers which make for excellent flower arrangements, both fresh and dried. Ozawa allium (Allium thunbergii 'Ozawa'): A tidy, clump-forming plant that grows 18″ to 20″ high. Soil type. Herbaceous alliums (such as Allium tuberosum and Allium Millenium) have fiberous roots like other perennials. As its Latin name says, these are the big guys. 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