90-120 Days to maturity. Allium cepa. Borettana Yellow Cipollini Onion Seeds. Non-GMO, annual, perennial, open-pollinated, heirloom, cold tolerant, bulbing, short-day onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. Resistant to Pink Root Rot. The Borettana Yellow Cipollini type onion is a short day that grows 3-4 inches wide and about 1 inch thick. Its shape is described as small, flat, or button-shaped. Cipollini onions are known as Italian gourmet onions. They sweeten with cooking and are great for pickling. Even though they are small, they are good for storing up to 5 months. ~ 6,500 seeds/oz.