Petunia Seeds,
Superbissima Cosmic Cherry

Start petunia seeds indoors 8-10 weeks before the last expected frost. Transplant seedlings outdoors once all danger of frost has passed and temperatures stay above 50 F. In warmer climates, petunias can also be directly sown into the garden in early spring or fall. If you’re unsure of your last frost date, consult our blog post ‘Our Experts Answer Questions, Share Resources.’

Surface sow the seeds, as they require light to germinate. Keep the soil evenly moist and maintain a temperature of 70-85 F during germination. Once seedlings develop several true leaves, transplant them into larger containers or directly into the garden, spacing them 10-12 inches apart to give room for their large, ruffled blooms.

Water petunias about once a week, but avoid overwatering to prevent root rot. A balanced liquid fertilizer every 2-3 weeks will encourage continuous flowering. If plants become leggy, trim them back by one-third to promote new growth. In extreme heat, blooming may slow down, but providing light afternoon shade can help reduce stress. Pinching young shoots makes for a more compact growth habit.

• Petunias will readily self-seed in mild winter climates.
• To save seed, hand-pick the brown seed pods.
• Take care to collect the seed pods before they burst and spread the seeds across the garden.
• Store the seeds over winter in a cool, dark, dry place.