Keep flowers pinched back while using the leaves … Without this, it'll be unlikely to thrive. This'll encourage bushy rather than lanky and weak growth. Germination will usually take two to three weeks. Pay now with a credit card and take advantage of our earth-friendly automatic renewal savings plan. The key to success is to locate dark opal basil in a sheltered spot. Although this species can cope with hot, humid or dry conditions, it prefers cooler, more temperate regions. She has been involved in the Pet Industry for over 15 years.Dark Opal Basil produces purple/pink flowers in the summer months. This striking new plant caught her attention with its robust appearance and large, relatively smooth, long maroon leaves with deeply serrated margins. Organic Gardening E-Book Projects Collection Move into a partially sunny spot as leaves develop. Direct Seed: 1/8" Deep. Amend the soil with 1 to 2 inches of manure and 4 to 6 inches of compost, working them into the top 6 to 8 inches of soil.Transfer the dark opal basil plant to this soil 6 weeks after planting it in the pot, during the spring when soil is warm. Basil also likes plenty of water or it can get droopy. After growing purple basils for nearly twenty years, it’s my opinion that nurseries should produce these stunning purple-leaved annuals from cuttings rather than seeds to preserve the uniformity of the plants they sell. Although I have seen recipes recommending use of the leaves, African Blue basil is primarily ornamental for me.Rooting basil cuttings is so easy and quick to do in a cup of water that it is worth a try; it’s a great way to keep basil plants going indoors under fluorescent lights where short, young plants perform best, or in a sunny window. Purple Ruffles lacks the more assertive anise fragrance of Dark Opal. The “creation” of lovely, exciting new herb varieties is still largely chance even when tempered with a breeder’s knowledge, and the randomness of these varietal changes, for all its charm and mystery, makes one wonder if other, less inquiring eyes have not viewed the beauty of these changelings in some lost and wild past.While I have always relished uniformity, I gained a new appreciation of the untamed essence of many herbs with their frustrating and lovely ability to re-create themselves by seed with unexpected variations. Keep the soil consistently moist during germination, which takes about 14 to 21 days.Select a planting site that receives full sunlight exposure. well-draining soil that’s amended with well-composted materials. To my surprise, 18 percent of these offspring were green or variegated; 24 percent were, to my hypercritical eye, a pale purple/green combination, while the remaining plants were dark purple. In summer, attractive spikes of small, tubular cerise flowers arranged in whorls are borne above the foliage. These fickle little purple-leaved herbs also allowed me to see varietal creation in a new and more organic way, and the force of randomness and chance in nature took on new importance. Water the roots slowly and deeply.Pinch off growing flower buds by hand as they appear, to encourage bushier growth.Dan Ketchum has been a professional writer since 2003, with work appearing online and offline in Word Riot, Bazooka Magazine, Anemone Sidecar, Trails and more. He heard of a purple basil in the collection of Helen Darrah, author of a monograph titled The Cultivated Basils, that he thought might help, but when he grew it, only the flower bracts were purple; the leaves were green. Sweet basil, including "Purple Ruffles" and "Dark Opal Purple" varieties, is a warm-weather plant that will not do well in daytime temperatures below … Now I had all these purple-leaved basils that were both practical and beautiful, and I found them enchanting. Make sure the fertilizer isn't too strong and that you don't use too much. Working at the university’s Storrs Agricultural Experiment Station, he planted the seeds, and up came what he later termed “a mixed batch” of plants. Despite this devotion to maintaining varietal integrity, “We had a couple of good generations,” said McGee, “before we lost it.”The genes that cause purple in basil appear to be so unstable that even vegetatively propagated plants can lose their purple color. Unfortunately, I don’t believe this change will happen soon because of the additional expense of vegetative propagation and the ready availability of inexpensive, if variable, seed.My summer of purple-leaved basils was an exciting time of personal and horticultural discovery. Purple Ruffles lacks the more assertive anise fragrance of Dark Opal. If you’ve a mind to be experimental, you can create a sinfully unusual treat by adding liquefied purple basil leaves to crème fraîche.