Plant dormant allium bulbs in the fall according to your growing zone. The flowers are large round and purple, growing 6-8" in diameter, in late Spring to Early Summer. Planting: Plant bulbs in fall for a spring bloom. A perfect background plant. Allium ‘Millenium’ Ornamental Onion: USDA Zone: 5-9: Plant number: 1.032.070. Allium bulbs are fairly low maintenance, have dazzling flowers, and tend to deter pests, making them a great addition to most gardens. Organic compound fertilizer, which is raked into the soil, is especially good to use for this. One of the nice features of allium bulbs is the range of hardiness zones where they will grow. If you like unique and whimsical plants you should consider planting allium bulbs. Botanical Name: Allium. Allium giganteum, Giant Onion, Giant Allium. Bulbs prefer sandy soil and will rot without excellent drainage. This makes it easier to appreciate their unique shape. Tip: Leave Allium seed heads after they’ve finished flowering for the garden birds to enjoy! Our Bloom Time Chart for Alliums shows when each type of allium blooms. Their long-lasting blooms make a bold statement and are always a great topic of conversation for passersby. I highly recommend these cute little plants. Allium bulbs are versatile and are hardy in most climates. Do: Check the zone. Exposure: Full Sun. NAME: Giant Allium Globemaster SCIENTIFIC NAME: Allium Giganteum COLOR: Purple 6 - 8 inches round flower heads PLANT SEEDS: Outdoors after frost / Indoors weeks before last frost BLOOM TIME: Late Spring - Mid Summer HARDINESS ZONE: 4 - 9 PLANT HEIGHT: 36 - 48 inches PLANT SPACING: 12 - 15 inches LIGHT REQUIREMENTS: Sun SOIL/WATER PREFERENCES: Average QUANTITY: 25 Seeds … Allium bulbs grow in hardiness zones 3-9. FALL PLANTING: BULBS FOR ZONE 5 & 6. Hardiness: Zones 4-8. Plant individual cloves, peels intact, pointy end up, 2 inches deep and 6 inches apart. wide (12-15 cm) globe-shaped cluster. Full sun in well-drained soil (add grit on heavy soils). When to Plant Alliums. Alliums are spectacular plants, so it’s worth saving a few seeds to sow in spring to grow more for the garden. The best effect is gained by planting a clump of bulbs—three to five spaced well apart for large alliums or a group of 10 to 15 for smaller species. Zones 5-9 While some species spread vigorously through seeds or bulbils, many varieties do not spread at all. Try planting bulbs in a triangle or a circle shape, and "have fun with it," Wood said. Time to Plant Alliums . The allium needs a lot of plant nutrients from spring on up to the blooming period. Blooming in late spring to early summer, this Giant Allium enjoys long-lasting blooms and remains ornamental in the garden well into summer. Time to Plant Alliums Blooming Onions! Gardeners in cold … Easy to grow. More. Plant bulbs in fall no more than 2 to 4 inches deep, depending on bulb size. USDA Hardiness Planting Zones. Name: Allium spp. USDA Hardiness Zones: 3 to 11 Size: 4 to 60 inches tall Conditions: Full sun; fertile, well-drained soil Among dozens of showy cousins, densely flowering chive (A. schoenoprasum, Zones 5–11, right) and our jaunty native nodding onion (A. cernuum, Zones 4–8) are superb subjects to grow from seed. A truly impressive hybrid Ornamental Onion from Mark McDonough considered to be the best available in years. Send Text Message Print. Mulch 5-8 inches deep with seedless straw. However, how well the soil drains is far more important than soil pH. 7. The small and middle sized alliums (A. cowanii, 'Hair', ' Purple Sensation ', sphaerocephalon, atropurpureum and Nectaroscordum) can be planted en masse. ) between the bulbs sit in damp soil, is especially good to use for.! Hairs—Hence, it’s other common name: downy onion rot without excellent drainage true... 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