- Sow early indoors / under cover with warmth 4-6 weeks prior to the last frost in individual pots or trays.
- Cover seed with 1/4 inch fine soil.
- Keep soil moderately moist and warm during germination.
- You can sown directly outdoors after danger of frost is pass through early summer.
- Thin or transplant to 12 inches apart when plants are 2 to 3 inches tall.
- Gradually acclimatise outside after all danger of frost has passed.
- Cosmos grows best in full sun in ordinary garden soil and may re-sow itself.
- Fairly drought resistant, water only when soil is dry for an extended period.
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