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How to Grow Cosmos
Easy to grow, hardy Cosmos produce daisy-like blossoms from mid summer to fall. Cosmos are native to Central America and Mexico.
Cosmos grow quickly. Some varieties reach a height of up to six feet. Bright colored single or double flowers come in white, pink, orange, yellow, and scarlet. Big blooms are 2" to 6" across.
Tall Cosmos plants are best placed at the back of the flower garden. With little care and attention, they will produce long lasting flowers, that make good cut flowers in vases.
Kids and new gardeners love the big, easy to handle Cosmos seeds. They can be planted outdoors in early spring. Cover seeds with 1/8" of soil.
Space seeds " to 6" apart. Thin plants to 18" apart. For indoor starts, allow 4 to 6 weeks before the last frost.
Most Cosmos varieties are annuals. There are a few perennial types. Perennial varieties are Rhizomes, which can be propagated by plant division, or separation of the Rhizomes.
How to Grow Cosmos Plants:
Grow Cosmos plants in full sun to partial shade. They are best grown in average to poor soils. If grown in rich soil, you may end up with lots of foliage and fewer flowers. They are tolerant dry soil conditions and are heat resistant as well.
Most varieties will grow quickly to 3-4 feet. Some varieties can reach six feet. Taller plants may require staking.
Deadhead flowers to promote additional blooms.
Insect and Disease:
Insects and disease problems are uncommon. Apply insecticides or fungicides only as needed.
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