Tuckeri is one of the rarest things that we have ever listed. A naturally occurring intersectional hybrid, it has been listed as a cross between N. hedraeanthus and N. fernandesii. But our Spanish friends say it is a cross between fernandesii and N.blancoi : N. hedraeanthus is an endemism of the Cazorla Segura Mountains and the Villas. Remarkably different in size and shape. Besides, it's made of calcium soil and higher altitude. The N. Blancoi on the other hand is Sierra Morena endemism, acidic soil and doesn't require so much altitude. Larger in size and other morphology. I invite you to look in our publications both and compare them carefully. One more reason: Fernandesii is not in Hedraeanthus zones at all.. Inas De Bellard Pecchio