Plant Profile: Cosmos

Cosmos is a resilient flower that thrives in hot, arid conditions and can self-seed, making it an excellent option for gardens in North Carolina. These hardy annuals will provide vibrant blooms from summer until the first frost.

For optimal growth, plant cosmos in an area that receives at least six hours of direct sunlight each day. Sow the seeds outdoors once the threat of frost has passed and the soil temperature reaches a minimum of 65 degrees Fahrenheit. Lightly rake the seeds into the soil, as planting them too deeply can impede germination. Maintain moisture in the soil for 5 to 10 days following seeding; germination typically occurs within 7 to 21 days. With minimal care, cosmos will reward you with a profusion of colorful flowers throughout the summer. Be aware that taller varieties may require staking to withstand strong winds and storms.

When you notice that the spring-planted cosmos has produced a significant amount of dried seeds, refrain from removing the plants. To promote further blooming, trim the plants back to a height of 12 to 18 inches. They will begin to flower again within a month, and the cut seeds will fall to the ground, germinating in the warm soil and enhancing both the density of your plant population and the overall floral display.