Pine needle mulch
It's often said that pine needle mulch is good for acid-loving plants. I mulched a Eucryphia with all my Christmas tree needles and it certainly seemed happy, though that could be a coincidence. Does anyone know if it's specifically pine needles, or would other conifer droppings also work? My yews have a bit of an old needle clear out occasionally, and the leylandii drop bits constantly. Would either be beneficial for my acid-lovers, or would I be wasting my time?
'If you have a garden and a library, you have everything you need.'
I've often heard about the needle mulch but I'm not sure it's not a bit of an old wives tale.
I've not seen any documented experiment which proves any difference of pH due to it.
How deep would the mulch layer have to be to actually change pH? No idea.
Maybe it's just one of many things said so often that we believe it?
I think mulching is a wonderful idea, maybe it's just the mulch which has helped, rather than it being of needles? I don't know.
However, if we assume that they are beneficial or at least benign (I know it's not a given), my query is really about whether it's conifer droppings in general, or only pine needles?
which backs up your and @Hostafan1 's suspicion that this is an old wives' tale, @LG_.
If it isn't true for pine needles, I suspect it's not true for other conifers either...
This is the stuff I'd read about it: