Posted: 08/06/2012 at 13:22
I totally forgot to mention what I saw on Gardeners' World, from last year, I think. Rachel visited a pair of hostaholics, June Colley and John Baker, who had something like 1300 different kinds of hostas, which were all in pristine condition. Their recipe for success was garlic - apparently, it serves as a mild nerve poison for slugs, so they leave the leaves alone, and it kills the eggs, when you spray it on the soil. The recipe for making the garlic spray was as follows:
Put a whole garlic in a plastic bag, smash it with a rolling pin or other heavy tool.
Add the smashed garlic to 1L of water, let boil on the stove for 5 minutes.
Let it cool, then sieve it, then bottle the garlic water and store in the fridge.
Add 1 tblsp/1L of water in a spraybottle as needed, preferably a long nozzled one so you easily can get in under the leaves to spray the soil.