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Viola cornuta 'Callisto Black Duet'
© Deeproot Plant Base
growth rate: medium
leaf colour: green
flower colour: violet
main season: Spring
full sun, part shade
moist soil, sandy soil
preferred soil pH: neutral-acid
minimum temp: -18°C
USDA zone: 7 to 9
Small flowers of blue-violet with dark blackish purple upper petals, over a long period in spring and summer. Dense low growing evergreen foliage.
Moist, well drained, reasonably fertile soil in sun or part shade.
Dead-head to prolong flowering.
Cut back after flowering to keep tidy.
Borders, bedding or containers.