Clarkia

To transplant, sow 4 weeks before planting out. Lightly cover seeds with 2mm soil. Harden off seedlings before planting out after last frost. If direct seeding, do it as soon as the soil can be worked. Keep soil surface moist until emergence. Thin to 6-12" once seedlings have first true leaves. After germination, plants prefer cool growing conditions. Seedlings are best grown at 16–18°C day temperatures/10°C nights; should not exceed 21°C. High temperatures during plant development can cause weak, spindly stems.

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