91-98 Days to maturity. Brassica oleracea var. capitata. Osaka Flowering Cabbage Seeds. Non-GMO, cool weather annual. Osaka Series Osaka Flowering cabbage seeds grow a classic and elegant swirl of color perfect for any cool-season garden. Osaka Series seeds mature into tight 11-12 inch tall Osaka Flowering cabbages bursting with Pink, Red, or White colored leaves. Osaka Series belongs to the capitata group or "headed" variety of cabbage and boasts a flowery and showy mound that still resembles the tight compact store-bought heads. Osaka Series seeds grow dazzling and vigorous frost-hardy splendor that promises to thrive where others have lost their sheen. 100 seed Packet.