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Growing Cosmos flowers
Sow the cosmos seeds directly just before the last frost.
Give 12 inches of space between the plants.
Spread the cosmos seeds over freshly turned bare soil.
Press the seed into the dirt, and do not cover the seed.
Cosmos seeds germinate quickly.
Cosmos plants normally grow to 4-5 feet in a season.
Most of the Cosmos varieties are annuals, but there are perennial varieties also.
Perennial varieties of cosmos are Rhizomes and can be propagated by division.
Caring Cosmos flowers
Spent flowers should be deadheaded regularly, as it keeps cosmos in bloom for many weeks.
Overfertilizing and overwatering reduces the flower production.
Cosmos flower plants are drought tolerant but water Cosmos plants during long dry spells.
After the plants die after the first frost, remove them, and keep as compost, which helps as mulch for the next year plants.