Tropaeolum minus aka Bush Nasturtium

Tropaeolum minus, or dwarf nasturtium, belongs to the Tropaeolaceae family. Its native range runs from southern Ecuador into central and southern Peru. It grows in damp sites at higher elevations within seasonally dry tropical regions. Gardeners grow it as an annual, though it can be a short-lived perennial. It forms a bush rather than a tall climber.

Plants reach about 1–1.6 feet (0.3–0.5 m) tall. Their spread can reach 1.6 feet (0.5 m). The round, shield-shaped leaves reach about 0.26 feet (0.08 m) across. Small teeth mark the leaf edge where the veins end. Single flowers grow where each leaf joins the stem. They open from early summer through autumn. Their orange to red-orange petals have pointed tips. Some flowers show purple veins or red marks near the base.

Full sun gives the best bloom, though plants accept light shade. Choose soil that drains well and stays moist. The plant dislikes drought. Chalk, loam, and sand suit it, across acid to alkaline conditions. Sources differ on whether rich or poor soil is best. Both agree that rich soil boosts leaves at the cost of flowers. Poor soil suits plants grown mainly for bloom. RHS gives it hardiness rating H3; PFAF lists USDA zones 8–11. Useful Tropical Plants calls it frost-tender and describes spring sowing for temperate gardens.

Use it in beds, borders, pots, rock gardens, or gravel gardens. It also suits banks and slopes. Sow seeds under glass in spring. Plant seedlings outside once the risk of frost has passed. Plants may seed themselves, but late seedlings may flower poorly. No routine pruning is needed. Removing spent blooms can help prolong the display. Whitefly, red spider mites, and viruses may cause trouble. Slugs, snails, and cabbage white caterpillars can damage the leaves.

PFAF lists the leaves, flowers, seeds, and young pods as edible. Leaves and flowers have a sharp, cress-like taste. Young pods taste hotter and can be pickled as a caper substitute. Seeds can be eaten raw or cooked. PFAF also records medicinal uses and insect-control uses. These records do not establish safe or effective treatments. Although PFAF reports no known hazards, RHS warns of skin allergy. Wear gloves when handling plants if skin contact is a concern.