80-90 Days to maturity (from transplant). Solanum lycopersicum. Sparks Tomato Seeds. Non-GMO, warm season annual, open-pollinated, heirloom, potato leaf, indeterminate, slicing. Suitable for growing in garden plots, raised beds, and greenhouses. Sparks Tomatoes are a potato leaf plant that produces large 3-inch perfect beefsteak tomatoes. ~ 6,800 seeds/ounce.