Zinnia Seeds,
Redman Super Cactus

Plant seeds after the last frost date for your region, usually in late spring. Alternatively, you can start seeds indoors about 4 weeks before the last expected frost and transplant them once the soil has warmed up. Zinnias are highly sensitive to frost, so planting at the right time is essential. 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 ¼ inch deep, and keep the soil moist until germination, which typically takes 4 to 6 days. Space seedlings 9 to 12 inches apart to allow proper growth and airflow. This spacing is very important to prevent common fungal issues, such as powdery mildew. Mulching around the base can help retain soil moisture and reduce weed growth. If starting indoors, use biodegradable pots or other means to minimize root disturbance when transplanting​.

Redman Super Cactus zinnia requires full sun and moderate watering, especially during dry periods. Light fertilization throughout the growing season can improve flower production. Pinching the first buds encourages bushier growth and a higher yield of flowers.

• 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.