100+ days to maturity. Allium tuberosum ‘Broad Leaved Nira’. Broad Leaved Nira Chinese Leek Seeds. Non-GMO, cool-season perennial heirloom. This popular Chinese specialty herb is a vigorous perennial for its young flower buds, long stems, and broad, deep-green blades. It is an excellent choice for home gardens and commercial growing. The savory and handsome flower stems are considered gourmet in many parts of the world. This Japanese variety of Chinese leek has deep green, broad, thick leaves with a garlic-onion flavor. Its tolerance to heat and cold makes it very easy to grow. ~ 9,300 seeds / oz.