Zinnia Seeds,
Orange Cactus

Sow Orange Cactus Zinnias outdoors after the last frost, or start indoors about 4 weeks earlier for an extended bloom period. They germinate best in warm soil, 75 to 80°F, and typically take 75 to 90 days to flower, blooming through summer and early fall. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

Plant seeds about ¼ inch deep, spacing 9 to 12 inches apart for good air circulation. This spacing helps prevent powdery mildew, a common zinnia issue in humid conditions. Water thoroughly after planting, but avoid waterlogged soil, as these flowers do best with moderate soil moisture. If starting indoors, use biodegradable pots or other means to minimize root disturbance when transplanting​.

Once established, these zinnias are low-maintenance and drought-tolerant, but they do appreciate consistent moisture, especially during dry spells. A light, balanced fertilizer applied every 4 to 6 weeks can improve growth and blooming.

• 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.