Oxheart Carrot 200 Seeds #8136 Item Upc#650348691721 80-90 days. This very old, hard-to-find heirloom can weigh 1 pound or more. Stout, excellent quality Chantenay carrots grow to a heart-shaped 56 inches. Owing to their bulbous nature, they tolerate heavy soils better than most, but also grow well in sandy soil types. 200 Seeds A great choice for container gardens too, providing lots of food value when soil depth can be a limiting factor.