"Rebecca" wrote in message
oups.com...

My cat has adopted a corner of the garden as her "litter tray". I do
try to remove the offending articles but I do this a couple of times a
year and they are well fossilised by then!

Are there any plants which wd stand the ammonia in the soil?

Sounds like they already have the fluid side of things leached out so
anything already growing around there will either have adapted or died.