[Maciek416]

At least _prior_ to knowing anything else about regolith, aside from it sometimes having volcanic origins: Speaking as a person who grows a wide variety of woody tree species (pines, maples, junipers, cottonwoods, azaleas, etc) in inorganic substrates like pure perlite, pure lava, pure pumice (+combinations of those and other volcanic media), and has seen all of these tree species happily send roots into things like IKEA astroturf or blocks of Rockwool, it doesn't surprise me that regolith could maybe work as a grow media.

[a1369209993]

> pure lava,

Is this jargon for some lava-derived rock like obsidian or basalt? Because I'm fairly sure even extremophile bacteria, never mind any kind of tree, wouldn't be able to grow in actual (ie molten rock) lava.

[rich_sasha]

Fascinating... dare I ask, is that a hobby? A very unusual job?

[Maciek416]

Bonsai. Hobby for me, but unusual job for my mentors.

[gibolt]

Is it not the case that they'd be 'looking' for good soil beyond those surfaces, even if it wasn't there?

It makes sense evolutionarily to 'just work' when possible, especially since the alternative is death