Mammillaria hahniana

Mammillaria hahniana, the old lady cactus, is a species of flowering plant in the family Cactaceae, native to central Mexico. It grows to 25 cm (10 in) tall by 50 cm (20 in) broad. The solitary spherical stems, 12 cm in diameter, are covered in white down and white spines. Reddish purple flowers are borne in spring and summer, sometimes forming a complete ring around the apex of the plant.[2]

Mammillaria hahniana
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Cactaceae
Subfamily: Cactoideae
Genus: Mammillaria
Species:
M. hahniana
Binomial name
Mammillaria hahniana

Its status is listed as "Near Threatened" by the IUCN Red List.[1]

Cultivation

Mammillaria hahniana is one of several Mammillaria species to be cultivated. In temperate regions it must be grown under glass with heat. However, some growers report that it is quite hardy down to −5 °C (23 °F) or even −10 °C (14 °F). Like all cacti it must be kept dry in winter, and fed and watered during the active growth cycle in summer. Increasing quite readily and flowering at a relatively early age, it is a suitable subject for domestic cultivation.[3] It has gained the Royal Horticultural Society's Award of Garden Merit.[4][5]

References
  1. Bárcenas Luna, R.; Gómez-Hinostrosa, C.; Guadalupe Martínez, J. & Sánchez , E. (2013). "Mammillaria hahniana". IUCN Red List of Threatened Species. 2013. Retrieved 25 February 2016.CS1 maint: ref=harv (link)
  2. RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. p. 1136. ISBN 978-1405332965.
  3. "Mammillaria hahniana Werd". Encyclopedia of Cacti. Retrieved 3 April 2018.
  4. [Mammillaria hahniana "RHS Plant Selector - Mammillaria hahniana"] Check |url= value (help). Retrieved 3 January 2021.
  5. "AGM Plants - Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 63. Retrieved 3 April 2018.
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