This Mexico native is one of the simplest flowers to grow, and they are suitable for all zones. Since they reseed themselves easily, they make perfect additions to wildflower meadows or naturalized areas. Children will love planting their cosmos seeds and watching them grow taller than they are!
When to Plant Cosmos Seeds
Plant Cosmos in the Spring when the soil can be worked.
Where to Plant Cosmos Seeds
Sow your Cosmos seeds in the full sun to partial shade. As cosmos flowers are very adaptable, they can thrive in average to poor soil quality, and they are tolerant to dry conditions.
How to Plant Cosmos Seeds
Cosmos seeds require light to germinate, so be careful not to cover them too much when planting. Learn more about germination light requirements here.
Scatter cosmos seeds outdoors after there is no longer a danger for frost. Seeds can be covered ¼ inch since they need light to germinate. Germination will usually occur in just 3 to 5 days, but it can take up to 2 weeks.
How to Care for Cosmos
Once started, cosmoses require virtually no attention. You can add a general purpose fertilizer once or twice a season. If a plant grows very tall and is not planted in a wind protected area, it may require staking. If you want blooms all summer long, dead head the old blooms.
My two row flower “field” and my favorite visitor | Nicole from Idaho
Kristina’s fresh cuts from our Garden of Eden | Ona Stewart from California
Pollination! | Christina from Colorado
Flowers Reaching the Sky ! | Christina from Colorado
Afternoon visitor, Monarch on Sulfur Cosmos | Linda LaBelle from Virginia
Zen Flowers | Diana Sanders from Texas
Cosmos in my Garden | Christina Olson from Nebraska
Dramatic Cosmos | EMILIA from Virginia
A Blushing Bouquet! | Ledley from West Virginia
My personal Eden made from Fairytale Flower Seed Mix | Ketra from Illinois
Pollinator gardens do a garden good | Jen from North Carolina
Field of yellow! | Martha from Minnesota
Cosmos | Terry from Connecticut
Florida Wildflower Bloom | Kim from Florida
Cosmos flower in my garden (Psyche) | Patricia from Delaware
Cutting Garden Outside my Bedroom | Lyn from Georgia
Cosmo garden | Michelle from California
My cosmo garden | Michelle from California
Cosmos and Zinnias | David Stewart from North Carolina
Alice in the cosmos | Kelli from Virginia
Summer Love | Chrmn_l@yahoo.com from Massachusetts
Sleeping Bees | Nannety from Indiana
Butterfly visiting my cosmos | Stacey from North Carolina
Purple Haze | Cindy Williams from Tennessee
A country girl’s garden | Judy from South Carolina
Labor of love | Stephanie from Illinois
My wife bloom garden begin!!! | Martin from
Wild cosmos mix | Noel from New Mexico