Grow Heirloom Tomatoes - Oxheart Tomato Seeds. Oxheart Tomato plants produce big, beautiful, heart-shaped tomatoes known mostly to old-time gardeners. Tomatoes are simply beautiful with their pointed shape, but it is the intense tomato flavor that really makes this one special. Both meaty and juicy, its sweet, rich flavors erupt from its deep red flesh. Large, fleshy and smooth skinned fruits.