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Very much doubt you'll be able to successfully transplant wild moss
There is a story about this in the excellent book Gathering Moss by Robin Wall Kimmerer. She was essentially employed as a moss consultant for some billionaire building a stately home type garden and basically concluded that the only way that works is nature doing its thing.
I've heard lots about making a yoghurt/moss slurry etc but not ever seen any claimed successful results
But in your case, not least because the iron sulphate is most likely still there? Any idea how long it will take to degrade or wash away
lemonade-
Any idea how long it will take to degrade or wash away
That's my big question... it's a small area though so if I need to take action to rectify it I certainly can do whether it's covering with a layer of peat/ soil or adding something else to neutralise the iron sulphate...
I just don't know what that is though?
Nahguavkire
I think you can but the only options I've fond locally are for terrariums so small quantities and expensive...
I could probably scavenge some from the tree areas at my folks house though...