On 2013-11-29 16:43:38 +0000, Emery Davis said:

On Fri, 29 Nov 2013 15:59:43 +0000, Sacha wrote:

On 2013-11-29 14:10:25 +0000, Emery Davis said:

[]
Anyway I still think a pressure washer is the right solution for this
kind of work. I've used it to clean moss and lichen off of stone and
brick walls, very easy.

I must be missing something here. I LIKE moss and lichen! I'm not
tallking about the green slippery fimy stuff but the hummocky pretty
stuff.

Best it's not there if a bit of wall needs repointing though!

I understand that but the OP isn't talking about a wall. He's talking
about it *between* paving stones, where many would grow low-growing
herbs if conditions were less moist or shady.

We have some wood fence with tons of lichen on it, I wondered the other
day if it's not making it rot a bit faster...

Acting as a sponge, you mean? All I can say - quoting Tresco again as
my source - is that there's a wooden fence on one part of the island
that surrounds a horse paddock. I've only known the island for 14
years but to my certain knowledge that fence has been there at least
that long. Every plank of it is topped with lichen, so that it looks
as if it's rimed with frost, even in August. The fence should, in
theory, be destroyed if the lichen was harming it, or so I would
imagine.

--

Sacha
www.hillhousenursery.com
South Devon
www.helpforheroes.org.uk