Cosmos Flower Not Blooming. They are tall strong bushy I pinched out and utterly without blooms. Since you have good blooming from the seed you purchased these should not be the problem.
Try not to let them go to seed. Apr 09 2021 Cosmos are freely flowering annual plants that are easy to grow simply by sowing seeds in the garden after any danger of frost has passed. By removing old and decaying blooms from the stems it forces the plant to generate more blooms and flowers.
Cosmos Flower Diseases Reasons Cosmos Flowers Are Dying By Bonnie L.
These members of the sunflower family attract butterflies make wonderful companion plants and will keep blooming up until your first frost providing wonderful late summer color. My cosmos are huge almost 55 feet tall with no blooms. If youre in search of a flowering plant that blooms throughout the Summer season then cosmos plant is a good choice. Thin to 1218 inches apart when seedlings are a few inches tall.