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Winter test



Cultivation and Mail Sale
of Cacti and Succulents.


International winter hardy cactus test
This test has been possible thanks to the collaboration of cactus impassioned, growers, collectors, clubs, botanical gardens and researchers of all the world.

See the updated list of international participants


 The purpose of this great project is to verify experimentally  the outdoor resistance to the cold of two plants grafted on a frost hardy Opuntia compressa stock in different nations and climates:

Pediocactus despainii SB1014 near San Rafael Swell Emory Co, Utah from Typical Locality 
Sclerocactus glaucus SB1749 De beque, Garfield County, Colorado, USA


  Pediocactus despainii



Sclerocactus glaucus SB1749 De Beque, Garfield County, Colorado, USA  plants cultivated for the winter test  


Rule of the test

  • Each participant received the free plants (Two Pediocactus despainii and one Sclerocactus glaucus) for the test and send: A photo of its town, a photo of the local landscape and a photo of the its own plant collection.

  • A page with the list of the participants to the project and the photos of the various places where the plants are cultivated has been realized on this site, so everyone one may know something about the environments where the tests are carried out.

  • When possible further information has been furnished:  Altitude of the place where the plants are cultivated, Locals minimum and maximum temperatures, a brief description of the climate (rainy, dry, etc.), the URL of the personal site of the participants (if owned)

  • Each participant at the arrival repotted the test plants with his usual soil mix and then send a photo of the plants already planted in their pots. The plants has been normally cultivated as usual for other cacti in the personal way used by each participant!

    Of the two Pediocactuses one has been be protected during the winter in the greenhouse with the other cactuses, the other Pediocactus and the Sclerocactus instead has been left for the whole winter outdoor in a sheltered place avoiding  direct rain.


  • During winter the minimum temperatures has been collected and the results of the test has been compared, and updated photos has been regularly added in each personal page of the test. In spring 2004 and subsequently the appearance and the state of health of the plants has been verified.

A special thanks to the people that have already agreed to this initiative




See the updated list of international participants




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