Cosmos bipinnatus--Mexican Aster
Cosmos bipinnatus--Mexican Aster
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Cosmos bloom in late summer and grow from three to six feet tall. The plants are easy to grow but tend to sprawl so need support or lots of room. Provide a good garden soil, a sunny exposure, and shelter from the wind. Cosmos are at their best in autumn. Space plants 10 to 12 inches apart. Over fertilization produces lots of foliage but few blooms. Some shelter from the wind is suggested. The flowers are good for cutting.
Some varieties come true from saved seed. The seed germinates in five to seven days at 68 to 86 degrees. The seed can be planted directly into the garden after the danger of frost has passed.
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