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key growing information
Growing Cosmos From Seed
How to grow cosmos from seed: starting plugs or sowing direct, pinching, spacing for strong stems, support, cutting stage and deadheading.
By Hensley’s Seed Co.
Cosmos - Key Growing Information
DAYS TO GERMINATION:
Seedlings appear in about 7–10 days at 68–72°F (20–22°C).
SOWING:
For transplants, sow into 50-cell plug flats or your usual containers 5–7 weeks ahead, covering the seed lightly; harden off and plant out after the last frost. To sow in place, wait until after the last frost and until the soil is above 60°F (16°C), again covering lightly. Pinching the tips encourages more branches.
LIGHT PREFERENCE:
Full sun.
PLANT HEIGHT:
Depends on variety. Tall types appreciate shelter from wind or a horizontal support net such as Hortonova.
Cut when the petals are just unfolding but haven't flattened out. Deadhead regularly to keep plants blooming all summer.
SOIL REQUIREMENTS:
Any soil.
USES:
First-rate cut flowers; also good in beds, containers and massed plantings.
SCIENTIFIC NAME:
Cosmos spp.
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