The Q&A Archives: Non-flowering Cosmos

Question: I started some cosmo plants from seed this spring (late March). I planted them outside in mid May. The plants are doing great. A few are three feet tall! My problem is that they have not started flowering as of June 13th. Could this be a problem with the seeds that I started them from initially? I purchased a few other cosmos from a local farmers market as small plants and they have been producing flowers for a month. What can I do to bring on the flowers?
Thanks for your help.
Tracy S.

Answer: I don't think there's anything wrong with your cosmos. They may be a different variety than those you purchased, or they may simply be too immature to bloom at the same time. Quite often, plants grown in greenhouses are given lots of fertilizer and are grown under ideal conditions. Those growing in a garden have to put up with the weather and cool evening temperatures which could retard their flower production abilitities. Give your plants a few more weeks of sunshine and warm weather and they should begin blooming their little heads off.

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