Cosmos Flower Planting Time. Dec 11 2020 Sowing time varies it depends on the season variety and the place where you are living. Hot dry conditions along with poor to average soil are optimum conditions for growing cosmos.
Cosmos plants are usually grown from seed. Cosmos bloom continuously until the first frost. Oct 18 2009 Hot weather and hot soil are the triggers that get cosmos seeds going.
Here you can grow them from September to March.
They are happy planted in moderately poor soil. In dry hot climates place a shade cloth over the bed until the seedlings begin to sprout. Plant out in late AprilMay after the danger of frost has passed. Daisy-like flowers of the cosmos plant.