Patterson Onion 200 Seeds #0616 Item Upc#650348692032 104 days. Extremely long storage onion. 200 Seeds. Patterson has the same firmness and storage qualities as Copra, with a larger size, better uniformity, and higher yield potential. Medium-large, blocky bulbs with dark yellow skin and thin necks that dry quickly. In April or early May, or as soon as the soil can be prepared in early spring, sow in a 2" wide band, about 2 seeds/in., 1/4- 1/2" deep, rows 12-18" apart. Thin to 1 1/2-2" apart for highest yields in fertile soil. Thin to 3-4" apart for larger onions and 4" apart for the "sweet mild" type.