May 23, Stuart Estell rated it it was amazing. A superb work on the smaller genera of Mexican cacti with lavish photography. Library categories Return to Book Page. While this might leave a beginner collector scatching thier head as to what this means; those more seasoned will be able to fondly guess at which species are covered in this book. Ariocarpus Retusus,fisuratusfisuratus lollyfurfuraceos,trigonus y fisuratus intermedio. Chill Fai Yee shared his post.

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Just to give an understanding of the severity of the winter, the plants saw almost constant frost for more than 10 weeks, with temperatures measured as low as C 5 F in the area where the plants grow.

Lophophora williamsii var. My Trans-Pecos peyote plants are doing quite well, approximately one in eight died and the surviving plants are not too marked by the frost. The Trans-Pecos peyote is the northernmost form of Lophophora williamsii and is also known as Lophophora williamsii var.

Trans-Pecos peyote surviving the frost My regular Mexican and south Texan Lophophora williamsii plants fared much worse, less than one in ten of the larger plants survived the winter. One of the few surviving Lophophora williamsii var. I have several times had the smaller form from south Texas [L.

The Cactus Conservation Institute has an informative page on the differences in traits between Lophophora williamsii var. But many medium sized seedling plants actually survived while the larger plants of the same variety and yearling seedlings succumbed.

The surface-area-to-volume ratio SA:V decreases with size, i. Consequently a large plant will need relatively longer time per unit of volume to go flaccid and prepare properly for the winter as all excess water needs to be evaporated through the surface the epidermis. Similarly seedlings are more prone to die of drought as an increased SA:V means increased exposure to the environment in general. Ariocarpus has turned out to be an unconditional coldhouse success.

I expected my Ariocarpus fissuratus plants to make it safely through the winter as they originate from locations like Fort Stockton, Texas JM and Crockett County, Texas SB , but I had doubts about my Ariocarpus kotschoubeyanus var.

Amazingly they all survived the winter in great style almost looking lush and vigorous, like a winter swimmer surfacing with renewed energy after a cold plunge. Surviving Ariocarpus, Epithelantha, and Leuchtenbergia plants Epithelantha is another seriously cold tolerant genus. My Epithelantha micromeris var. The Epithelantha bokei plants SB ; Brewster Co, Texas also look fine, but due to the extremely dense spination it is hard to say for sure if they are completely undamaged.

Strangely the cold has taken the hardest toll on my regular Epithelantha micromeris SB; near Belen, New Mexico — this variety of E. Surprisingly approximately two thirds of the plants survived as illustrated in the above picture the surrounding pots are not empty, each contain a rather large L.

Other success stories are Normanbokea valdeziana , Homalocephala texensis , and Mammillaria meiacantha which all made it through the winter without casualties — the Normanbokea plants are even budding. Most Escobaria and Echinocereus obviously had minimal problems with the frost. Frost killed Lophophora williamsii turning to mush As mentioned above the majority of my larger, regular Lophophora williamsii plants were killed by the frost, but the more tender Lophophora species like Lophophora diffusa and L.

Dead Lophophora diffusa Other species that are completely wiped out include Matucana madisoniorum , an unknown Echinopsis hybrid, Ferocactus glucescens PP , Lithops lesliei not exactly a cactus, I know ;- , and Harrisia jusbertii.

Surprisingly all my Mammillaria grahamii also died — I had expected this species to be more cold hardy. Most of my saguaro cactus Carnegiea gigantea also succumbed to the frost — 4 plants look like they might survive, most of them badly damaged, but it is too early to say. I need to start building a new collection of grafting stock — all Trichocereus plants that I grew in the coldhouse are dead, including Trichocereus pachanoi, T. Even plants that were well prepared for the winter died, so Trichocereus is definitely not as tolerant to frost as I had expected.

Decomposing Trichocereus plants To put the death toll into perspective this is the coldest winter in 14 years in Denmark followed by March, a month with the most extreme temperature fluctuations in 14 years, which were not very becoming to my struggling plants either. The frost set in just before Christmas and only lifted again in the beginning of March. The lowest temperatures measured in the area were as low as C 5 F. Outdoor temperature in late January Once in a while short bursts of thaw set in quickly followed by frost as indicated by the above graph , making the conditions even harder for the plants.

Outdoor temperature in mid February The temperature measurements come from a semi-professional weather station located approximately 1. To end on a positive note I expect the frost to have killed off many pests also including red spider mites. Also, I got an affirmative confirmation that it is actually possible for peyote to survive rather extreme conditions in an unheated greenhouse in Denmark


Ariocarpus et cetera






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