80-90 Days to maturity (from transplant). Solanum lycoperscium. Mamie Brown’s Tomato Seeds. Non-GMO, annual, open-pollinated, heirloom, determinate, slicing tomato. Suitable for growing in garden plots, raised beds, and greenhouses. The fruits can be oxheart to oblate shaped. Mamie Brown’s Beefsteak Tomatoes are delicious and packed with flavor. ~6,800 seeds/oz.