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Protection from slugs

I put a bunch of 9cm pot plants into the ground this spring, and noticed a few are getting chomped on. My initial reaction was to tolerate the damage in the hopes of building an ecosystem, but I'm now curious about the techniques everyone uses to protect their young plants from slugs. I've put a jam jar over one of the plants - could that work as a sort of cloche?
Also, I notice not all plants get munched e.g. Phlox paniculata on one side of the garden have been bitten down to the stems, and they are mostly fine on the other sunnier side. One young astrantia is fine, whereas two others next to it have so far been mostly untouched.
Also, I notice not all plants get munched e.g. Phlox paniculata on one side of the garden have been bitten down to the stems, and they are mostly fine on the other sunnier side. One young astrantia is fine, whereas two others next to it have so far been mostly untouched.
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https://forum.gardenersworld.com/discussion/1063605/perennials-in-9cm-pots-plant-out-now#latest
I don't plant them out at this time of year, for the reasons given in that thread.
I live in west central Scotland - not where that photo is...
@Emerion - oop. Will be removing said jam jar.