On 29/04/18 17:44, David wrote:

Remember it is a raised bed not a full garden.
After digging and preparing the ground it could be covered with Tildenet
ground cover fabric and planted through.
Other fabrics are available but I found Tildenet lasted me over 3 years
whilst a cheaper one didn't last 3 months in sunlight.
If the raised bed is small enough then the soil could be taken out
seived and put back.

That's a good idea - thanks!