When & Where to Plant Zinnias

• Light: Zinnias grow and flower best in full sun. They can flower in part shade, especially in warmer climates with afternoon shade, but they may be more susceptible to disease and have fewer flowers.
• Soil: Zinnias grow best on fertile, well-drained soils high in organic matter. Well-drained soil is important because zinnia seedlings can be prone to rotting in cool, wet soils.
• Spacing: Plant zinnia seeds a few inches apart in rows or clumps. Thin to 8 to 18 inches apart, depending upon the variety, once the plant has grown four leaves.
• Planting: Plant zinnias in spring after all danger of frost has passed, around the same time you'd plant tomatoes. Zinnias are easy to grow directly-seeded into the garden. For sooner blooms, start seeds indoors 4 to 6 weeks before your last frost date.