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Originally Posted by Paradiso
...Also it seems like I cant pollinate dendrobium...
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That's because many of them are not necessarily self fertile and it is difficult to cross Dendrobiums between sections. To guarantee success, you must outcross and/or you must cross within the same section.
My recommendation to those with rare Dendrobium species is to get at least a pair, and start breeding. If you want those species around, breed them into the hobby. Don't wait for a nursery to breed them into the hobby, because most nurseries are thinking about what sells. If that special Dendrobium of yours does not really sell well, and that dear Dendrobium drops dead on you for any reason, there isn't necessarily someone who'd be willing or able to share another individual of that species with you.
Not to mention, nurseries can get sold or go out of business.
Plants can just as easily go "extinct" in our hobby just like they can in the wild. Worst case scenario is that the orchid species goes extinct both in the wild and in the hobby - then it's tough luck, it's a Dodo; once alive, now gone, but always in our memories.