90-120 Days to maturity. Allium cepa. White Grano Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, cold tolerant, bulbing, short-day onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. Though they can be grown in any area of the country, Texas Grano Onions are grown heavily in the South and West. They are a short-day variety of onions. As an annual crop, they are slower to bolt and are considered a great producer. ~ 7,000 seeds/oz.