Zinnia Seeds,
Oklahoma Carmine

Plant Oklahoma Carmine zinnia seeds after the last frost date in your area. For earlier blooms or in colder areas, start seeds indoors about 4 weeks before the expected last frost. Direct-sown seeds bloom in about 60 to 70 days; starting indoors does not shorten that count, but it does bring first bloom earlier in the season. 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 directly into the ground at a depth of ¼ inch, spacing them 9 to 12 inches apart for good airflow. Indoor seed starts can be sown in trays, with seedlings ready for transplant once they have two sets of true leaves. Seeds usually germinate in 4 to 6 days. The ideal germination temperature is 75 to 80°F. If starting indoors, use biodegradable pots or other means to minimize root disturbance when transplanting​.

Water deeply, allowing the soil to dry slightly between waterings, as zinnias are prone to root rot if overwatered. Regular deadheading encourages continuous flowering, and pinching young plants promotes bushier growth. Apply a balanced fertilizer once at planting time, and mulch around the base to retain moisture and prevent weeds.

• 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.