Diatomaceous earth or crushed eggshells can also be spread on the surrounding soil to prevent or resolve this issue. The average range is 30-90cm (1-3ft) Plant out when danger of frost is passed. Their height depends on cultivar and on growing conditions. Flowers in summer through early autumn, peaking in August and September. Can grow as a cut flower crop, as blocks of bedding or in containers. Keep the seed and media moist by using a plastic cover over the seeding tray. Follow these guidelines for successful seed propagation: Plant deep and cover with vermiculite. Use a growing media specifically designed for germinating seeds. If slugs are troublesome, treat the surrounding soil with pelletized iron phosphate. Zinnias are best grown on sheltered, warm, free-draining sites. Zinnia seeds can be started indoors about 6 weeks prior to the anticipated outdoor planting date. If problems arise, treat with an organic fungicide or neem oil. Fill the cell trays with the soilless mix. ![]() It is best to plant the seeds in separate containers, such as cell trays or peat pots, to prevent root disruption during transplantation. You can usually accomplish this by by gently tipping the container on its side and easing the mass out, pushing up from the bottom as needed. To do this, carefully remove the whole chunk of soil, seedlings and roots out of their small container. Avoid wetting the leaves.įertilizer: Mix in an organic, all-purpose granular fertilizer soon after planting out, and again when flowering begins.ĭiseases & Pests: Avoid fungal issues by spacing properly and placing in a location with good air circulation. Starting zinnias indoors is easy: Start the seeds in late spring, approximately 4 to 6 weeks before your last frost date. Another method used to thin seedlings is by gently separating them. Keep moist, watering only in the morning. Also, it is best to soak dried seeds in water for 4-6 hours before planting. Remember that germination is less successful in cold soil. Watering Details: Tolerates drought, but performs best when watered regularly. Should you soak zinnia seeds before planting Seeds can be planted indoors 6-8 weeks before the last frost and the seedlings can later be easily transplanted into your outdoor garden. Pinch back when seedlings reach about 6-8" in height to encourage bushy growth. Placement & CultivationPerfect for mixed borders, beds, or containers, zinnias will brighten up almost any location with full sun and rich, well-drained soil. Growing Guide When to Set OutsideAfter last spring frost, when night temperatures remain above 50☏.
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