Wow very interesting subject. I have also an piece of wood sticking out of my nano cube, where I also want to grow some plants or mosses emers. So if I'm understanding the subject well, I can take some moss out of my garden en put it on the wood in my tank a over the waterline.
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Yes you could, depending on the moss sp. but in my experience all of them are sensitive to sudden substrate changes.. It first will look like dying, but if addapted it'll come back. And some don't. If you look in the garden you see mosses all over the place, growing on rock or wood, in the garden that rock is commonly a kind of concrete, these mosses like calcium substrate and might not like to grow on wood and visa versa. Or like to grow on both but is not used to the sudden change and might die or take a long time to addapt. Trail and error.
Also something to think about, moss likes to grow on old wood or on bark.. This is something we like to avoid in and above aquariums, we like to use barkless fresh hard wood. So getting moss to grow on fresh hard wood can be a challange to find one that likes it, if it does it need a lot of care and attention.
🙂 I've not yet tried myself. But i have the hunch it just must work and definitively will do in my next project.. Find some large enough pieces of bark in the forrest or park.. Soak it for a number of days so it gets softer and you can bend it. Wrap it aruound tie it with some thread and put the moss on the bark. That would be a better substrate to grow on than a piece of fresh hardwood.
Opuwa wood, grows moss very good. This bellow still looks a bit the same after 2 years..
That rododendron, spider wood is a bugger, not yet found a moss that realy likes to grow to it.. That's how i came up with the bark idea.
If you look very good, you might find ppieces of bark in the forest already growing mosses. But than watch out for bugs in it.
🙂