Allium giganteum
Giant Onion
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Giant Onion (Allium giganteum) - Description
Allium giganteum, also known as Giant Onion, is a perennial bulbous plant of the onion genus, used as a flowering garden plant, and growing to 1. 5 metres (4. 9 ft). It is the tallest ornamental Allium in common cultivation. In early to midsummer, small globes of intense purple flower heads (umbels) appear, followed by attractive seed heads. A popular cultivar, 'Globemaster', is shorter (80 centimetres (31 in)) but produces much bigger, deep violet, flower heads (15–20 centimetres (5. 9–7. 9 in)). Both varieties have been granted the Royal Horticultural Society's Award of Garden Merit.
Giant Onion (Allium giganteum) - Blooming
Small flowers form balls on the tips of the flowering stems that are good for both fresh and dry floral arrangements.
Giant Onion (Allium giganteum) - Growth
Spring, summer, or fall flowering bulbous and rhizomatous perennials. Does well with full sun or partial shade.
Giant Onion (Allium giganteum) - Planting
Good candidate for filling in borders. Depending on the variety, can be planted via bulbs or seeds. In fall or spring plant as deep as the bulb is tall or wide, whichever is bigger. Self-seeds.
Giant Onion (Allium giganteum) - Pest
Onion fly and thrips.Like most plants that have bulbs, damp conditions makes Allium more prone to bulb rots caused by soil-borne fungi. Plants are especially vulnerable just after planting.Allium is also susceptible to white rot, mildew, fungal leaf spot (purple blotch and gray mold), and smut.
Giant Onion (Allium giganteum) - Interesting facts
Allium is a diverse genus of bulbous perennials that includes such plants as onions, garlic, chives, leeks, society garlic and giant ornamental onions. They all have relatively high concentrations of sulfur compounds which give them their unique smells and flavors. When the plant tissue is damaged some of these sulfur compounds are released, which explains why we cry when we cut onions. The sulfur compounds can dissolve in our tears, where it forms sulfuric acid. In response to the acid in our tears, we blink and produce more tears. This gives the impression that cutting onions makes us cry.
Giant Onion (Allium giganteum) - Soil and irrigation
Requires regular water during the growing season. All species need well-drained soil, especially soils on the sandy side. Keep dormant plants dry.
