Nasturtium (Tropaeolum) Two-inch, single and double blossoms on plants 8 to 15 inches tall. Climbing variety reaches 6 feet. Shiny, rounded, green leaves. Mixed colors and bicolors. Soil and Light Full sun. Likes sandy soil, but will grow almost anywhere, if soil is kept dry. Planting Plant seed outside after frost danger. Comments Will flower more abundantly in poorer soils. Use leaves as tasty, colorful additions to salads. This annual seems to thrive on neglect.