The trouble with most anti-slug methods is nothing's a 100% guarantee - but the more different methods you can throw at them the greater the chance of winning.
Eggshell & coffee work for some people but I've found others say they have no effect - same with copper tape & wool pellets. Beer traps seem to do well if regularly emptied & refilled.
I think one thing to remember is how agile slugs are - they don't stick to just sliming their way across soil but will climb walls & other plants to come in from another angle to reach their favourite targets.
I'm happy to use the type of pellets Mark recommended on the plot but in my small yard at home where I only grow in pots & it's enclosed by walls, my most effective method has been torchlight removal by hand - persistently every night. Over time - & I'm talking 2-3 years - I was able to reduce the population to a manageable level where I can get by with just protecting new plants but the established stuff can cope & I don't have to scare the neighbours with my strange night time rituals.
Edit to add - I've never used garlic spray against slugs but would suggest coverage is likely key to make sure both sides of leaves are well coated & replying after rain.
Eggshell & coffee work for some people but I've found others say they have no effect - same with copper tape & wool pellets. Beer traps seem to do well if regularly emptied & refilled.
I think one thing to remember is how agile slugs are - they don't stick to just sliming their way across soil but will climb walls & other plants to come in from another angle to reach their favourite targets.
I'm happy to use the type of pellets Mark recommended on the plot but in my small yard at home where I only grow in pots & it's enclosed by walls, my most effective method has been torchlight removal by hand - persistently every night. Over time - & I'm talking 2-3 years - I was able to reduce the population to a manageable level where I can get by with just protecting new plants but the established stuff can cope & I don't have to scare the neighbours with my strange night time rituals.
Edit to add - I've never used garlic spray against slugs but would suggest coverage is likely key to make sure both sides of leaves are well coated & replying after rain.




The iris is pretty impossible to move now as it has created it's own solid island. If I cut chunks off I feel that any pond creatures like tadpoles etc could be harmed. I always wanted water boatmen, pond skaters but could never coax them in (before the duckweed came) now the duckweed is here there is no chance.
That chair was a freebie as it was thrown out at the back of an alleyway for anyone who wanted it. I don't mind the rustic look.

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