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Description:
Subglobose to
cylindrical, olive green, with magenta-red tint, to 4 cm high, 1
- 3 cm in diameter.
Tubercles: Small,
cylindrical/conical.
Spines:
Radial: 22 - 30,
plumose,
pinnated,
translucent, white to yellowish white, to 1 mm long, forming
little
spines clusters at the tubercle apexes.
Central spine: Absent.
Roots: Strong
taproot
Flower: Crocus-like,
funnelform, pink, unusually long-stemmed for a Mammillaria (3.5
cm in diameter and up to 5 cm long) that are many times larger than
the plant body itself, at least with plants on their own roots.
Stigmas pale yellow.
Phenology:
Blossoming time: May (but plants grafted flowers
repeatedly from April to September)
Cultivation:
M. theresae - like the other
Mammillarias of the saboae group - is
not the easiest of Mammillarias to grow and keep, this
is though it is easier than some of its
relatives such as M. goldii. But all this species
require similar
growing conditions, and a
mineral-based potting mix is preferred. They need to be kept
dry in
winter.
Pot plants are quite
wet-sensitively. Care must be taken with watering
and needs good
drainage. Water sparingly
during the
growing season, keep very dry in
winter. But plants grown outdoor seems to tolerate easily
the winter wetness. Usually it is recommended to
overwinter this plant in a bright and warm greenhouse with at
least 8-10° C , but it proved to be quite
frost resistant and demonstrated to
survive safely
outdoor under a cover of
snow at a temperatures of -15° C.
Sun Exposure: Full sun - Light shade
Propagation:
cuttings or (usually)
grafting.
Photo of conspecific
taxa, varieties, forms and cultivars of
Mammillaria theresae:
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Cultivation
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