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botanical name:
Solanum tuberosum 'Congo'
Solanum tuberosum 'Congo' © Deeproot Plant Base
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common name:  Potato 'Congo'
synonyms:  Solanum tuberosum 'Congo Blue', Solanum tuberosum 'Blue Congo', Solanum tuberosum 'Purple Congo', Solanum tuberosum 'Himayan Black', Solanum tuberosum 'British Columbia Blue', Solanum tuberosum 'McIntosh Black', Solanum tuberosum 'River John Blue'
family:  Solanaceae
characteristics: perennial
height: 0.60m
width: 0.60m
growth rate: fast
growth habit: clump
leaf colour: green
flower colour: white
stem/bark: purple & green
main season: Summer
poison symbol poisonous or irritant
edible symbol edible
medicinal symbol medicinal
aspect: full sun
conditions: moist soil, sandy soil
preferred soil pH: neutral-acid
minimum temp: -5°C
USDA zone: 8 to 10
Late Maincrop heritage variety, producing very dark, blue-black skinned tubers with purple flesh. The tubers are rather variable in shape, small to medium sized and often knobbly, but freely produced on an extensive root system. White or pale blue flowers. Vigorous and robust grower with attractive foliage.

Most fertile, well cultivated soils but dislikes very wet or heavy clay soil. Prefers a slightly acid rich soil with plenty of organic matter, the tubers can be subject to scab on limy, sandy or gravely soils or those deficient in humus. Likes a sunny position.

This variety needs a long growing season to make good tubers and crops very late.

From tubers.

Culinary vegetable.

other notes:
An old heritage variety, probably selected in Scotland sometime in the 19th century.

This may belong to the subspecies andigenum (aka. Solanum andigenum) and is at least suspected to be closely related to a wild South American species.

This cultivar has aquired a large number of alternative names. There are also a number of similar, proably closely related, varieties - causing considerable identity confusion.

All the green parts of the plant, even green parts of exposed tubers, are poisonous, containing a toxic alkaloid called solanine.
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