Found from Mexico to the southern tip of South America, this genus contains about 80 species of annuals and perennials commonly known as nasturtiums. Many are climbers, using their twining leaf-stalks to scramble and cling. Though variable, the foliage is often shield-shaped and tinted blue-green. All species have long-spurred 5-petalled flowers which occur in a wide range of mainly warm shades. The degree of development of petals and spurs varies, leading to a range of flower shapes and sizes. The genus name comes from the Greek tropaion (trophy), a term used for the trtee trunks on which were hung the shields and helmets of defeated enemies. Tropaeolum leaves (shields) and flowers (helmets) reminded Linnaeus of this Greek tradition, and he named the genus accordingly.
CULTIVATION
Plant in full or half sun with moist well-drained soil. Plants may need trimming back and support for climbing stems. Propagate by division, from basal cuttings, or from seed.
Top Tip
Tropaeolum seeds should not be sown until after the last frosts. Feeding is often not required and some species, such as Tropaeolum majus, actually prefer poor soil.
CULTIVATION
Plant in full or half sun with moist well-drained soil. Plants may need trimming back and support for climbing stems. Propagate by division, from basal cuttings, or from seed.
Top Tip
Tropaeolum seeds should not be sown until after the last frosts. Feeding is often not required and some species, such as Tropaeolum majus, actually prefer poor soil.
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