60-90 Days to maturity. Ocimum basilicum. Mammoth Basil Seeds. Non-GMO, annual, organic, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, raised beds, and greenhouses. Mammoth basil is a lettuce leaf basil, and has leaves that can stretch out as long as your hand. If you are a basil fan, this is the Granddaddy of the basil family. Featuring large, shiny, green, luscious leaves, a chef's dream herb. ~19,000 seeds/oz. 250 mg Packet.