Delphinium may be grown from seed sown early indoors and transplanted outside after frost, or sown directly in the garden in summer, or grown from potted plants. Sowing Delphinium Seed Indoors: Sow seeds indoors 8-10 weeks before last spring frost. Alternatively, sow seeds directly in flower beds in early summer. The optimum temperature range for germinating delphinium seeds is 60-68° F (15-20°C) . If you don't remove fading flowers, the plant forms seed, which you might be able to save and sow outdoors in fall for new plants next spring. Delphinium In Pot ‘Guardian Lavender’ delphinium is versatile in the landscape, growing equally well in containers, planting beds … Also, be sure to keep the potting mix or soil moist. Start seeds indoors about eight weeks before the last frost of spring. Mist the compost with water until the top 1 inch feels wet and let it soak in for five minutes before sowing the delphinium seeds. If sowing outside, you may want to let the seeds germinate first. How to Sow and Plant Delphiniums. Depending on the time of year, you may be sowing the seeds directly outdoors, if there are at least 6-8 weeks before first frost, or indoors. Germinating delphinium seeds requires a cold start so put your seeds in the refrigerator for about a week before planting. Sow 1/8 inch deep in seed-starting formula.
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