Allium sphaerocephalon
Round-Headed Leek
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Round-Headed Leek (Allium sphaerocephalon) - Description
Allium sphaerocephalon is known as round-headed leek and also round-headed garlic, ball-head onion, and other variations on these names. Other names include Drumsticks, and in Germany, Kugellauch. The orthographic variant A. sphaerocephalum is also found. It is a hardy perennial plant. It is grown by gardeners for its striking appearance when in flower. The purple spherical flower head is borne on a long spike, up to 50 cm in height, usually in the month of July. There are several varieties, including:Synonyms for Allium sphaerocephalon include Allium descendens L.
Round-Headed Leek (Allium sphaerocephalon) - Blooming
Small flowers form balls on the tips of the flowering stems that are good for both fresh and dry floral arrangements.
Round-Headed Leek (Allium sphaerocephalon) - Growth
Spring, summer, or fall flowering bulbous and rhizomatous perennials. Does well with full sun or partial shade.
Round-Headed Leek (Allium sphaerocephalon) - 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.
Round-Headed Leek (Allium sphaerocephalon) - 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.
Round-Headed Leek (Allium sphaerocephalon) - 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.
Round-Headed Leek (Allium sphaerocephalon) - 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.
