Malabar Spinach Seeds - Big Round Leaf. Heirloom, Basella alba. 50-60 days. Warm season annual. Non GMO. Open pollinated. This is a green big leaf variety. Leaves are thick. Slow bolting and heat tolerant. Prepare fertile, well-drained soil. Avoid clay soils. Sow seeds in late spring/early summer (soil temp at least 60°F) in a warm and sunny location or start seeds inside 6 weeks before last frost date (or 8 weeks before expected transplanting date). ~ 800 seeds / oz.