Red Army Amaranth Seeds. Non-GMO. Heirloom. Microgreen and Garden Seeds. Amaranthus cruentus. AKA: Blood Amaranth, Princes Feather, or Mexican Grain Amaranth. 100-130 days. Red Army amaranth is a darker and more robust cultivar of the already deep maroon Blood Amaranth. Red Army amaranth tastes, looks, and performs nearly identical to Red Garnet amaranth and is able to grow as a quick 8-12 day microgreen crop. ~ 37,500 seeds per ounce.