60 Days to maturity. Ocimum basilicum. Organic Purple Dark Opal Seeds. Non-GMO, annual, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, raised beds, and greenhouses. Purple Dark Opal basil is a striking variety known for its uniquely dark, almost black-purple foliage. This deep coloration makes Purple Dark Opal a visually stunning addition to gardens and floral arrangements. The plant typically grows 16 to 24 inches tall with a compact, bushy habit suited for borders or containers. Slow to bolt. The dark purple leaves have a metallic green undertone or sheen in bright light and are flat and open compared to many other varieties. Basil can also be grown for delicious microgreens. ~19,000 seeds/oz.