Cosmos likes at least 6 hours of sunlight each day. It may take about 85 days for the Sensation variety to reach maturity, so it could be that it just needs more time. Be sure that the soil is well-drained. Also be sure that the plants are thinned to the proper spacing and that there are no weeds nearby that are competing for nutrients, space, and light.
Cosmos likes at least 6 hours of sunlight each day. It may take about 85 days for the Sensation variety to reach maturity, so it could be that it just needs more time. Be sure that the soil is well-drained. Also be sure that the plants are thinned to the proper spacing and that there are no weeds nearby that are competing for nutrients, space, and light.