Spinacia Tyee (USDA Organic) Spinach, Spinacia oleracea 'Tyee Spinach', is a fast-growing, slow-bolting, semi-savoy spinach. It is very attractive with slightly rumpled dark green leaves. Spinach 'Tyee' is especially recommended for spring, fall and over-wintering crops. Ideal for salads, cooked greens and soufflés. Spinach thrives in cold weather because warm weather causes it to bolt. The ideal temperature for spinach to grow is between 50 and 60 degrees F. It is traditionally a winter crop in the South, and an early spring or late summer crop elsewhere. Traditionally spinach is planted about 4 weeks before the date of your average last frost. Spinach thrives in rich, moist ground. Add plenty of organic matter to soil prior to planting. (Click Merchant link below for full description)