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Slug prevention
I was watching Beechgrove this morning and they mentioned a limited test they did of slug prevention measures. Of the three options they used, coffee grounds were most effective closely followed by garlic spray. Both required reapplication after rain, so a good supply would be needed this year. Grit was by far the least effective. Host plant was delphinium. The test was cut short when 'pesky wabbits' got in and ate all the plants.
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I live in west central Scotland - not where that photo is...