Zinnia Seeds,
Lila Cactus

Sow seeds outdoors after the last frost date when soil temperatures are consistently above 60°F, or start indoors about 4 weeks beforehand. If you have a longer growing season, you can sow in succession every 2 to 3 weeks to extend the bloom period into 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.'

Direct sow seeds ¼ inch deep, spaced 9 to 12 inches apart to ensure good air circulation, which helps prevent powdery mildew. If starting indoors, use biodegradable pots to minimize root disturbance when transplanting​.

Water young plants deeply once or twice a week, but allow the soil to dry slightly between waterings as mature plants are drought-tolerant. Avoid overhead watering to keep leaves dry, which reduces fungal issues. Pinching early growth encourages a bushier habit, and regular deadheading keeps blooms continuous through the summer​.

• 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.