Ivy On House Walls

With regards to the ivy on house and garden walls it will need to be cut
hard back every two years to keep it under control.The problem with ivy
on old walls which have been constructed with lime mortar is that after
a few years it completely excludes and moisture from rain water reaching
the surface of the wall which in turn causes the lime mortar to dry out
complete.This makes the lime mortar very powdery so that it can be
become eroded away and the ivy roots start to grow in the wall.To avoid
this you need to cut the ivy back so you create areas within the ivy
coverage were there are gaps so the rain water can access the wall keep
the wall moist.