Does anyone know if there are any species (not varieties/cultivars) that are extremely difficult / impossible to root from stem cuttings?
Just curious but why? and why did you make a username so similiar to one of the regulars here? Like I said, just curious.
I don't think that there is much call for Lemna cuttings! but thanks anyway... I was just interested if there were any species which we still couldn't propagate, whether there was some innate reason why some species can or cannot root. As to my username, well that is a mystery wrapped in an enigma, transmodulated into a riddle......
My point was - the question is pretty vague! If you're talking hardwoods, Elm, Maple, and Oak come to mind, and of course in the softwoods the conifers. But leaving the question completely open, you will get responses like Lemna, because it fits the bill....
Doesn't Lemna reproduce all too easily from cuttings? That's how it reproduces naturally. Welwitschia would be tricky. Cycads, too.
There's lots of plants done by tissue culture and grafting because - at least for commercial purposes - cuttings haven't worked out. Different operators also have different experiences and inclinations - and when a plant has been "cracked" by a commercial propagator in the past they haven't necessarily shared their recipe with others. So there may have been some instances where the general knowledge of how to get a plant to root has never been acquired even though it may have been solved by a nursery at some point.
