They will have an ample alternative food source I imagine - or you have a huge population of slugs. Also, frogs and toads have an optimum slug size that they can cope with. They will eat all of the smaller slugs but often can't cope with the very big ones. I found that my slug population decreased slowly over a number of years - probably due to the preference for young slugs. Slugs can live for up to 5 years, so it would take around that time to see the difference. To maximise their impact, I'd try placing toad abodes (upturned cracked plant pots for example) in the places you want to minimise slug damage.
I just went for a wander round the garden between showers and rescued a bee and a frog. The bee was easily twice the size of the frog! (The bee was about to fall into the pond and the frog was heading up the path away from it)!
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They will have an ample alternative food source I imagine - or you have a huge population of slugs. Also, frogs and toads have an optimum slug size that they can cope with. They will eat all of the smaller slugs but often can't cope with the very big ones. I found that my slug population decreased slowly over a number of years - probably due to the preference for young slugs. Slugs can live for up to 5 years, so it would take around that time to see the difference. To maximise their impact, I'd try placing toad abodes (upturned cracked plant pots for example) in the places you want to minimise slug damage.
I just went for a wander round the garden between showers and rescued a bee and a frog. The bee was easily twice the size of the frog!
(The bee was about to fall into the pond and the frog was heading up the path away from it)!
I Want one dove, lovely chap
our host as got bombarded with the hailstones the other week, the leaves ended up like they'd been through a shredder. 