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Habitat:
wildernesses
of southern
Texas and Chihuahua desert (north-east of Mexico), from 700 to 2400 metres
(2300-7900 ft) of altitude.
Description: small, globular plants that tend to become cylindrical
and develop branches with age. They have woolly axils, elongated tubercles
with conical, elliptical or rhomboidal section, radial spines and produce
large flowers in the spring. It is not easy to distinguish the genus from
Gymnocactus and Turbinicarpus. They can give a second flush of
flowers in the autumn.
Soil: mineral mix with the addition of chalk.
Location: full sun.
Temperature: minimum temperature of 5°C (41°F).
Water: average but restricted to the warmer months. It is not
tolerant of excessive wet.
Cultivation tips: propagate from seed, cuttings and offsets if these
are produced. Fertilize sparingly.
Main species: N. beguinii, dwarf species requiring plenty of
sun, water from March to September, mineral soil and a minimum of 5°C
(41°F); N. conoidea, var. grandiflora syn. Coryphantha grandiflora;
N. gautii; N. pseudomacrochele.
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