Posted: 18/03/2015 at 19:21
Well I'm totally against membrane. It's bloom in' awful. Not practical. So I definitely wouldnt add any membrane. Suppose you want to move plants again ....think about it.
tanty, what do your plants look like? Are they growing well? if so, the soil must be acid, which is fine.
For me, I would tackle the weeds in a careful way with plants in place. Top dress with ericaceous soil, yes.
a couple of points....those bark chips. Are they acid or alkaline? Not all the same. Alkaline and you can say goodbye to all your plants.
second, be careful how much you topdress. Azaleas and rhododendrons roots do not like their roots buried too deeply. So, moderation here I think.