I have many problems with snails and slugs in my garden. When I want to plant something I usually grow it far away enough from the garden until the plant is big enough to support some "attacks".
I was quite surprised today when I found 2 slugs and one snail in a plant, around 4 meters away from the garden (grass and other plants) and that is actually hanging in a wall support. I don't think they came with the plant so they had to spot it from the garden, walk 4 meters in pavement, risking their lifes, climb the wall, and then down the support.
This makes me think that I should reassess where I make my seed plot place and makes me wonder how far can they see or how do they find plants like this?