Description: Solitary cactus.
The form “longispinum” has longer and stiffer spines but
is practically identical to the normal form in stem and flowers
glaucous-green to grey-black, discoidal that
became elonged with time 10-25 cm tall, up to 12 cm in diameter, the
apex is slightly woolly.
Ribs: 10-16 straight, divided in well distinct angular ribs.
Radial spines: 5-7 25-35 (45) mm long
slightly bent against the plants body, clear brown with a darker base
when young, that became whitish-grey with a black base as they age.
Central spines: 0-2 very similar to the radials.
in the nearest periphery just around the apex 45-60 mm
long, 60-65 in diameter. Tepals ivory white with a brownish mid rib or
occasionally reddish, throat greenish with a basal reddish area. Style
white-greenish, stigma white. Anthers cream coloured.
Fruit: Globate or fusiform, 20-40
mm long green with white bordered scales.
and pretty easy, water
regularly in summer, keep rather dry in winter,
but can handle excessive water to few water, best
for half-shade but grow well in full sun and full shade too (but in
full sun turns an uneven brownish red colour). style="font-family: Arial">
Frost Tolerance: Hardy to -12C.
ripen, fruit must be significantly
overripe before harvesting seed; clean and dry seeds