sam wrote:
Tesco Express are doing a nice line in fresh oysters
No,I'm not OFF TOPIC,
and my January King cabbages are just skeletons.
We have had long heavy frosts lately, and I don't
think the destruction is due to caterpillars. More
likely the slugs.
I seem to remember that crushed eggshells deter
then, and I was wondering if I took a hammer to
the empty oyster shells and crushed them , then sprinkled
the fragments around the cabbages, would it deter
the slugs.
And is the shell harmful or beneficial to the soil.
Any help would be appreciated by me and the cabbages.

It is a well known organic use against slugs and it's also good for
brassicas as it makes the soil more alkaline which is beneficial
against club root and would help the soil in the future against this
fungal disease. Some people recently said that they've been plagued by
cabbage root fly because of the warm season. I've heard that burrying a
bit of rubbarb leaf in the hole when you plant your brassicas help
prevent them laying their eggs near the plant. (I intend to try this
next year )