White Leaf Amaranth Seeds. Open pollinated, Heirloom, Non-GMO. Amaranthus mangostanus. 30-40 days. Annual. Suitable for microgreesn. This variety of edible amaranth, also known as Chinese spinach. Its round, tender, light green leaves and stems contain more iron and calcium than Western spinach. This amaranth will tolerate hot, dry and moist climates. In warm temperatures (68-85°F) it grows fast and produces high yields. Approx. 27,000 seeds / oz.