Posted: 14/10/2014 at 19:58
Not sure how Lily of the Valley reacts to glyphosate but it works on most things. If I lived nearer I'd come and get some of them for my garden - I love them.
My concern is that you want to plant lavender in its place. If Lily of the Valley is happy that indicates to me that the soil is damp and heavy and the situation shady.
Lavender needs gritty free-draining soil and full sunshine all day.