We have a 1m by 5m patch of land that is full of shale rocks about 5inches deep. Under it is some kind of tarpaulin/underlay to stop weeds.
We would very much like to plant some bee and butterfly friendly plants here such as lavender. I am getting conflicting advice online and from friends.
Should we remove all the shale and the underlay and fill it with topsoil/compost before planting or can we cover the shale with a few inches of compost and plant straight on top?
I am happy to do either, I would just like the best end result.
Also open to any suggestions on what to plant to help nature - we live in the UK.