150 Days to maturity. Allium cepa. Early Imai Yellow Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, heat tolerant, cold tolerant, drought tolerant, bulbing, intermediate-day yellow onion. Suitable for growing in greenhouses, garden plots, and raised beds. This selection of Senshu Yellow matures 10-15 days earlier. An intermediate-day-length over-wintering variety that does best in Zones 5 and 6. Maturing to over 1/2 a pound, the large, yellow-skinned, thick, flat globe bulbs are crisp and mild. ~ 7,500 seeds/oz.