Thai Basil Seeds Sweet Basil Dark Opal Ocimum Basilicum 100 Herb Seeds Sweet Basil Dark Opal Ocimum Basilicum 100 Herb Seeds Buy Grow in a rich, well-drained, soil in full sun. Use its large glossy, purple leaves with large sliced tomatoes for fun contrast and a perfect flavor match that has been used since the turn of the last century! The leaves have a clove-like spiciness flavor which is a little too strong for pesto but great for almost any basil dish, and it's especially good for vinegars and oils. Keep seed moist until germination. Buy Dark Opal Basil Seeds: Heirloom Herb, Non GMO Online in India The sweet flavor and aroma make this variety spectacular for garnishes, salads, or creating flavored vinegars. Excellent choice for microgreens. Grows to an... This Basil herb variety is called Dark Opal. Sowing Rate: 1 seed per inch. This old time favorite Dark Opal Sweet Basil herb has been delighting gardeners and foodies alike for decades now. Plant Spacing: Rows 18 inches a part; thin seedlings 6 inch. Light Required: Yes Depth: 1/4 inch. Sweet Basil (Ocimum Basilicum Dark Opal) - Start these Basil seeds for both color as well as flavor. This Sweet Basil herb variety is called Dark... Start Basil seeds indoors near a sunny window 6 weeks before transplanting to the garden after danger of last frost.