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Cosmos

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Cosmos
Photo: Dick Culbert from Gibsons, B.C., Canada · CC BY 2.0 · Wikimedia Commons

Fact sheet

every fact quoted from its source
Days to germination7–10 days

“7-10 days at 68-72°F (20-22°C)” — Growing Cosmos From Seed | Johnny's Selected Seeds

Germination temperature69–78.5 °F

“68-72°F (20-22°C)” — Growing Cosmos From Seed | Johnny's Selected Seeds

Waterconsistent moisture during the early stages

“While cosmos are drought-tolerant once established, consistent moisture during the early stages helps them reach maturity faster” — Cosmos Days to Maturity: Variety-Specific Growth Timelines

Hardiness zonesZone 6

“The 🌼 Cosmos plant thrives in Zone 6” — Cosmos Days to Maturity: Variety-Specific Growth Timelines

Spacing12–18 in

“I space my cosmos 12-18 inches apart for dwarf varieties” — Cosmos Days to Maturity: Variety-Specific Growth Timelines

Propagationseed

“I always recommend checking the seed packet for exact maturity ranges” — Cosmos Days to Maturity: Variety-Specific Growth Timelines

Transplantbefore the last frost

“Start seeds indoors 4-6 weeks before the last frost” — Cosmos Days to Maturity: Variety-Specific Growth Timelines

Ready whenPetals just opening, but not yet flattened

“Petals just opening, but not yet flattened.” — Growing Cosmos From Seed | Johnny's Selected Seeds

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