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Description: Astrophytum myriostigma
multicostatum (With
multiple ribs) deviates
from the well-known
standard
A.
myriostigma
for having six or more ribs instead of five depending on clones. Plants
with more than 5 ribs has been found in habitat (even
if with a
very low frequency), but
most of the "multicostatum" found in cultivation are
not 100% true A. myriostigma but hybrid that have
inherited the adjunctive ribs from one of the ancestor (Presumably
A. ornatum). The flower are also very beautiful.
Stem: Almost spherical, the plants become shortly
columnar with age. The stems are smooth and can be over 90 cm tall and
5-10 (-20) cm in diameter.
Spines: None.
Ribs: 6 to 10 (Usually 7 or 8)
Flowers: Arise from the areole at the tip of the stem on mature
plant. up to 5 cm wide (or more), pale-yellow, shining-silk,
unlike the
5-ribbed plant.
Blooming season: Spring or late summer, They take up to 6 years
to bloom.
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Cultivation: Although regarded as a choice and difficult
plant in cultivation it is relatively easy to grow. It is sometime seen
as a grafted plant but grows very well on its own roots too. Use mineral,
well permeable substratum with little organic matter (peat, humus).
Water sparingly from March
until October, and keep perfectly dry in
winter, at temperatures from 5 to 15 degrees centigrade.
(but it is Hardy to -7°C for short periods).
In the rest period no high atmospheric humidity!!
Sun Exposure: Light shade to full sun.
Propagation: Almost exclusively by seed. Plants are sometimes
grafted onto column-shaped cacti.
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Cultivation and Mail Sale 
