
Appearance
It is a fast-growing plant, with trailing stems growing to 0.9–1.8 m . The leaves are large, nearly circular, 3 to 15 cm in diameter, green to glaucous green above, paler below; they are peltate, with the 5–30 cm long petiole near the middle of the leaf, with several veins radiating to the smoothly rounded or slightly lobed margin.Naming
The species was originally called ''Nasturtium indicum'' but the plant is not related to the true ''Nasturtium'' genus.The current genus name ''Tropaeolum'', coined by Linnaeus, means "little trophy". ''Tropaeolum'' is the diminutive form of the Latin ''tropaeum'', itself borrowed from Ancient Greek τρόπαιον : trópaion "trophy".
The Latin specific epithet ''majus'' means "larger" .
Habitat
The garden nasturtium is used as a food plant by the larvae of some Lepidoptera species including the dot moth, the garden carpet moth and the large white or cabbage white butterfly.
Uses
''Tropaeolum majus'' cultivars are widely grown as easy annual plants, for poor, damp soil in full sun. The large seeds are easy to handle individually.As they do not tolerate heavy frost they are best sown under glass in heat, and planted out after all danger of frost has passed. Alternatively, as they are fast-growing, they may be sown ''in situ'' in May or June.
Many flower colours are available, in the warm spectrum from cream through yellow, orange, red and maroon. Some have highly decorative marbling on the leaves.
The groups Whirlybird Series and Alaska Series have gained the Royal Horticultural Society's Award of Garden Merit.
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