90 days. This rare heirloom variety was developed in France in the late 1880's and produces a very large, heart-shaped root—typically 5—6" long and 3—4" wide with roots weighing up to 1 lb. each. The recommended variety for growing in heavy clay soil, Oxheart is also a great choice for container gardening. It has a pleasingly-sweet, mild-flavor and crisp texture, perfect for fresh eating, cooking and juicing.