M. geminispina var. nobilis forma cristata
standard Mammillaria geminispina nobilis is a eavily clustering
plant that form 30 to 90 cm large cushion. It
is among the most famous cacti for the dense withe spines and wool that cover
The beautiful crested form develops huge brain-shaped hemispherical
cushion. Older crested plant are very priced.
Stem: Light green whit latex, up to 18
cm high and 8 cm in diameter.
Tubercles: Rounded with latex. Axil: With white wool and 10 - 20 long white bristles.
Central spines: 2 pure white or white with dark tip that
protrude far out from the rest, straight or slightly curved, 2 to 4 cm
long (or more).
Radial spines: 16 to 20 chalky white, interlacing up to 7 mm long.
Flowers: Campanulate, pinkish to carmine red, with darker midveins,
to 20 mm long and in diameter usually in a ring in the growth of the
previous year but sometime more randomly over the body.
If grown from seed, M. geminispina
can take seven to eight years before flowering.
subspecies, varieties and forms:
- M. geminispina var. geminispina
(form with 2 central, white with darker tipped spines)
- M. geminispina var. brevispina
(form with 2 short darker tipped central spines)
- M. geminispina var. leucocentra
(form with 5-6 pure white central spines)
- M. geminispina var. nivea (form
with pure white spines)
- M. geminispina var. nobilis (form
with long spines)
Scientific name: Mammillaria
var. nobilis forma cristata
Garden origin (Nursery
Conservation status: Listed in
CITES appendix 2.
Common English Names include: Crested White Cactus,
Crested Twin Spined
- Mammillaria geminispina
- Cactus geminispinus
- Neomammillaria geminispina
- Mammillaria elegans
A.P. De candolle 1828
- Neomammillaria neo-elegans
- Mammillaria leucocentra Berg 1840
- Mammillaria geminispina subsp. leucocentra (Berg) D.R. Hunt
- Mammillaria albata Reppenhagen
It is a fairly easy plant to grow, don't requires
any special treatment, but need as much light as possible without
burning the plant to encourage the heaviest spine formation, if
kept too dark it may become overly lush and greener and could be prone
to rotting due to over watering.
During the summer it is best to keep the plants outside where the
temperature can rise to over 30 C with no harm to the plant. Furnish
good drainage and use a an open and free draining mineral compost that
allows therefore roots to breath. They like only a short winter's rest
and should be kept almost completely dry during the winter months, If
the soil is allowed to be dry for too long root loss could follow but
equally the same result would occur if the plants are both wet and cold.
From March onwards the plant will begin to grow and watering should be
increased gradually until late May when the plant should be in full
Water regularly during the summer so long as the plant pot is allowed to
drain and not sit in a tray of water. During hot weather you may need to
water the plants more frequently so long as the plant is actively
growing. From late September watering should be reduced to force the
plant to go in to a state of semi dormancy, by October you should be
back in to the winter watering regime.
Feeding may not be necessary at all if the compost is fresh then, feed
in summer only if the plant hasn't been repotted recently. Do not feed
the plants from September onwards as this can cause lush growth which
can be fatal during the darker cold months. Grown
specimens resist to -4°C for a short time, but it is best to keep above
0° C to avoid ugly spots on the plant epidermis.
Propagation: By stem cuttings from adult plants
in spring or summer or by grafting.
Pieces of crest must be dried out for at least 3
weeks before planting in coarse river sand. This is quite an easy
alternative and success is almost always guaranteed.
Photo of conspecific taxa, varieties, forms and cultivars of