60-70 days. Organic Vates Blue Scotch Curled Kale Seeds. Brassica oleracea var. acephalla. Non-GMO. Heirloom. The premier variety of curled kale, Vates Blue Scotch is a tenacious cold-weather favorite known to thrive in partial shade, cool springs, and can even withstand several inches of snow after the hard autumn frost. Although curled kale can withstand freezing gardens, Vates Blue Scotch is still sensitive to heat and will bolt to seed in the summer warmth. ~8,000 seeds per oz.