Zinnia Seeds,
Exquisite

Plant zinnias after the last frost when soil temperatures reach at least 60 F. Seeds can be sown directly in the garden, or started indoors about 4 weeks before the last frost to get a head start on the growing. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

Sow seeds 1/4 inch deep, spacing plants 9-12 inches apart to allow air circulation and prevent mildew. Seeds germinate within 4-6 days under warm conditions. If starting indoors, use seed trays with good drainage, keeping the soil moist but not waterlogged​. Use biodegradable pots or other means to minimize root disturbance when transplanting​.

Water zinnias at the base of the plant to avoid wetting foliage, as this can lead to powdery mildew. Apply mulch to help retain moisture and prevent weeds. Zinnias benefit from light fertilization during the growing season but don’t require heavy feeding. Prune and deadhead regularly for continuous flowering​.

• Allow the flowerhead containing the seeds to mature and dry on the plant.
• Clip off the flowerhead and place it in a paper bag or other container.
• Working over the top of another clean, opened container, rub the flowerheads between the palms to break them apart.
• The seeds can be separated from the chaff by first screening and then winnowing.
• Store in a cool, dry, dark place over winter.