Nasturtium Seeds,
Tip Top Rose

Plant nasturtium seeds in spring after the last frost date has passed. For a head start, seeds can be started indoors 4 weeks before the last frost and transplanted carefully, as nasturtiums dislike root disturbance. The ideal germination temperature is 55-65 F. If you're unsure of your last frost date, consult our blog post 'Our Experts Answer Questions, Share Resources'.

Soak seeds in warm water overnight to soften their hard outer coat and encourage germination. Sow seeds 1/2-1 inch deep in well-draining soil and space plants 8-12 inches apart to ensure proper airflow and growth. Choose a location with full sun for the best flowering, but nasturtiums can tolerate some light shade in warmer climates. Germination usually takes 7-14 days.

Water moderately, letting the soil dry out slightly between waterings, as nasturtiums are drought-tolerant. Deadhead spent flowers to encourage continuous blooming throughout the season. Avoid fertilizing, as overly rich soil can result in lush foliage at the expense of blooms. Nasturtiums are relatively pest-resistant, though aphids may occasionally appear. If needed, treat with insecticidal soap or spray the plants with water.

• Nasturtiums will often reseed, but to save seeds, allow the flowers to mature and let the petals fall to the ground.
• Collect the seeds from the plant before they fall.
• When the seeds are dry, label and store them in a cool, dark, dry place over the winter.