On 2014-01-17 19:48:00 +0000, Roger Tonkin said:

Our house faces north, and as such the tarmac drive
gets no sun at all and is quite damp.

I've tried over the years removing the moss that grows
by scraping it off with a spade and blasting it off
with a power hose. Neither of which work really
successfully and are starting to damage the tarmac.

So it looks as if it must be a chemical attack, but
what with? I,m hoping to get to a garden centre next
week, so I'd like some idea of what has worked and
what to avoid if possible.

Many thanks

A very weak dilution of e.g. Jeyes fluid, perhaps? But not if it's
going to run off into any plants you do want to keep. If the moss is
dangerous to you with regard to walking on it, I quite see your
concerns. If it's not and you're only concerned about appearance, my
own view would be to enjoy it but nobody would call my style 'tidy'!
;-) I like moss.
--

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