Dazzling gold stripes on mahogany-brown petals mark each bloom as unique on this very free-flowering, semi-double Coreopsis. Irresistible to butterflies but left alone by deer and untroubled by heat, humidity, and drought, this carefree beauty self-sows freely, going from seed to bloom in just 12 weeks. Please note that Roulette is not a true perennial but rather an annual that readily self-seeds. An annual Coreopsis, Roulette is a selection of the native species tinctoria, the Plains Calliopsis. Just 18 to 24 inches high in full bloom, it spreads 12 to 18 inches wide in garden or container, a good all-purpose size that fills in bare spots and makes a fantastic mass planting. Superb for cutflowers and a treat in the garden, Roulette's balloon-shaped deep purple buds contrast nicely with the two-tone blooms. You will love this utterly distinctive color pattern, unlike anything else in the garden and certainly unique for a Coreopsis.
How to Grow Coreopsis From Seeds
- Coreopsis 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.
- Sow indoors 6-8 weeks before outdoor planting time, Sow ½ inches deep in seed-starting formul
- Keep the soil moist at 70-75 degrees F, Seedlings emerge in 15-20 days
- provide plenty of light on a sunny windowsill or grow seedlings 3-4 inches beneath fluorescent plant lights turned on 16 hours per day, off for 8 hours at night. Raise the lights as the plants grow taller.
- Incandescent bulbs will not work for this process because they will get too hot. Most plants require a dark period to grow, do not leave lights on for 24 hours.
- Seedlings do not need much fertilizer, feed when they are 3-4 weeks old using a starter solution (half strength of a complete indoor houseplant food) according to manufacturer’s directions.
- If you are growing in small cells, you may need to transplant the seedlings to 3 or 4 inch pots when seedlings have at least 2 pairs of true leaves before transplanting to the garden so they have enough room to develop strong roots.
- Before planting in the garden, seedling plants need to be “hardened off”. Accustom young plants to outdoor conditions by moving them to a sheltered place outside for a week. Be sure to protect them from wind and hot sun at first. If frost threatens at night, cover or bring containers indoors, then take them out again in the morning. This hardening off process toughens the plant’s cell structure and reduces transplant shock and scalding. Plant on a cloudy day or in late afternoon to reduce transplant shock