Tropaeolum majus These easy-to-grow plants produce colorful single and double blooms in light yellow, orange and deep red. A nice 15–18 inch, compact nasturtium for smaller yards and flower boxes. By providing adequate water and clipping seed heads, your nasturtiums will reward you with a profusion of blooms from July to fall’s first frost. The flowers make a lightly spicy edible garnish too! Approximately 7 seeds per gram. Germination code: (4)