Allium tuberosum is a rhizomatous, clump-forming perennial plant growing from a small, elongated bulb (about 10 mm, 13⁄32 inch, across) that is tough and fibrous.[7][6][8] Unlike either onion or garlic, it has strap-shaped leaves with triangular bases, about 1.5 to 8 mm (1⁄16 to 5⁄16 in) wide.