Late May I started 20 Echinocactus horizonthalonius seeds (SB 409; Shafter, Texas) and for several weeks nothing happened. But lately it has been extremely hot in Denmark and these weather conditions seem conducive to the germination of E. horizonthalonius.
Echinocactus horizonthalonius seedling, close-up
Two days ago 5 Echinocactus horizonthalonius seedlings had germinated – 25% is not an impressive germination rate, I know, but still I'm quite satisfied as these seeds seem notoriously difficult to germinate (in my meager experience with Echinocactus anyway ;-) 
Echinocactus horizonthalonius seedling
I look forward to growing these plants and hope they with time will grow to look like the beautiful Echinocactus horizonthalonius specimen pictured below ;-)
Echinocactus horizonthalonius, San Luis Potosí
The above habitat photo is by Kauderwelsch and is licensed under the “Creative Commons Attribution-Share Alike” license. The original picture can be found at the Wikimedia Commons.
Album der natuur. 1894 (added: 11/19/2024)
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*Publication Info:*
Haarlem :A. C. Kruseman ,1852-1909.
*Call Number:*
QK1 .A3655
*Contributing Library:*
Missouri Botanical Garden
1 hour ago
To be honest, the first time I saw that plant in teh picture I did't know which species it was. Only later could I find out, and from that moment I got in love with it. Its spination is so beautifully simmetrical and tough! In the same area in the picture I saw at least Lophophora williamsii, Echinocereus sp., Yucca sp., Fouquieria splendens, two Cylindropuntia sp. (one was most probably C. bigelovii and the ohter one no idea, but just thick as a pencil) 1 Ariocarpus trigonus, and Larrea tridentata ALL over one of the most amazing places I've seen!
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