Description
Parodia rudibuenekeri is a white, fuzzy cactus, usually solitary, or slowly clustering with spiral of dense white spines in columns.
Forma albissima (white form): This is a selected form with long, whiter and softer spines.
Stem: Globose-Cylindrical, erect, green, up to 20 cm tall, 5 cm in diameter.
Spines: Long, erect, very white, glassy and soft.
Flowers: Diurnal, opening in during the day and closing at night. Pale to bright yellow up to 4 cm in diameter, developing from white flower-buds.
Blooming season: Summer.
Origin and Habitat
The Notocactus rudibuenekeri comes from Brazil (West of Sao Gabriel, Rio Grande do Sul).
The pure white selection “Albissimus"" is of garden origin.
Cultivation and Propagation
This is an easy plant to cultivate. It require a mineral-based potting mix with a good drainage. Can support quite some water during the growing season but pot plants in winter are wet-sensitive and needs to be kept dry (rots easily if soil is wet and cold). Usually it is recommended to over-winter this plant in a bright and warm greenhouse with at least 8-10° C, but it has proved to tolerate temperatures as low as -5° C for short periods.
Sun Exposure: Light shade to full sun but doesn’t like full, hot blazing sun in the central summer month.
Propagation: Seeds, cuttings. Not too difficult to raise from seed.
Bibliography
Major references and further lectures
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Larocca, J. 2013. Parodia rudibuenekeri. In: IUCN 2013. “IUCN Red List of Threatened Species.” Version 2013.2. <www.iucnredlist.org>. Downloaded on 05 March 2014.
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David Hunt, Nigel Taylor “The New Cactus Lexicon” DH Books, 2006
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Edward F. Anderson “The Cactus Family” Timber Press, 2001
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James Cullen, Sabina G. Knees, H. Suzanne Cubey “The European Garden Flora Flowering Plants: A Manual for the Identification of Plants Cultivated in Europe, Both Out-of-Doors and Under Glass”Cambridge University Press, 11/ago/2011
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