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How to Grow and Care for Cosmos Flowers


Annual, Cosmos

If you are a new gardener, Cosmos are a great plant to start with. Fast growing, there is little that can go wrong with this tall growing plant. Cosmos are native to Central America and Mexico. They grow quickly to a height of 4-5 feet. Brightly colored single or double flowers include white, pink, orange, yellow, and scarlet.

Cosmos look great at the back of the garden and in informal arrangements.

Flower Height: up to 3 feet.


Plant Propagation:

Cosmos are grown from large seeds, making them easy to plant. They germinate quickly and never stop from there, normally growing four to five feet in a season.

For good germination, it is important to keep soil moist while germinating.

Sow Cosmos seeds directly into the garden just before the last frost in your area. Space plants 12 inches apart and thin to 18 inches.

While most Cosmos are annuals, there are perennial varieties. Perennial varieties are Rhizomes and can also be propagated by division.

Days to Germination: 7 - 10


How to Grow Cosmos Plants:

Cosmos plants prefer full sun to partial shade. They will do well in both average and poor soils. They are tolerant dry soil conditions. Add a general purpose fertilizer once or twice a season.

Taller plants may require staking. However, this can be avoided if planted in an area protected from the wind.

Flowers Bloom: Summer through Fall


Insect and Disease:

Insects and disease problems are very rare for Cosmos. If problems occur, treat early with organic or chemical insect repellents and fungicide.


More Information:

How to Grow Cosmos Plants

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