Zinnia Seeds,
Benary's Giant Coral

Zinnias are frost-sensitive, so plant them after all danger of frost has passed. In most regions, this means planting in late spring or early summer. Start seeds indoors about 4 weeks before the last frost date, or sow directly into the garden when temperatures have warmed​. For continued blooms, succession sow every 2 to 3 weeks through mid-summer​. 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 in well-prepared soil, spaced 9 to 12 inches apart to allow for good airflow. Indoors, use trays or pots, and cover the seeds lightly with fine soil, keeping the soil consistently moist. Transplant the seedlings carefully as zinnias are sensitive to root disturbance​.

Zinnias don’t need a lot of care if provided with full sunlight and well-draining soil. Water deeply, but let the soil dry slightly between waterings to prevent root rot. Fertilize lightly throughout the season, and continue deadheading for more blooms. Pinching the tops of the plants early on will encourage branching and bushier plants​.

• 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.