You know I just remembered that years a go, when I found my self going to a few
Rose Society meetings, the top old rose growers, the old ones who won all the prizes told me something.
They all would only use cow manure and rain water on their roses.
So what 'wee beastie' do roses like (or vice versa); that is in cow manure (
or encouraged by it) and is sensitive to chlorine in tap water?