Single Blend nasturtiums bloom in shades of scarlet, gold, orange, and yellow single flowers. Their long, trailing stems can be easily trained up a trellis or fence. The edible blossoms and leaves taste a bit peppery like watercress, adding a wonderful kick of flavor and color to salads. Usually grown as an annual; perennial in USDA zones 10 and warmer. Rabbit and deer resistant. When to sow outside: RECOMMENDED. 1 to 2 weeks after your average last frost date. Mild Climates: Sow in fall for winter bloom. Ideal soil temperature for germination is 55°-65°F. When to start inside: Not recommended. 2 to 4 weeks before your average last frost date. Roots sensitive to transplant disturbance; sow in biodegradable pots that can be directly planted in the ground. Special germination instructions: Soak seed in water for 12 to 24 hours before sowing. Darkness aids germination; sow at the recommended depth.