More than a snail-trail:
Oftentimes you will not spot a snail trail. Snails will also leave blobs of egg sacks in the soil. I call them aliens. Check your garden every morning and flick them out! Eggs hatch in 2 to 4 weeks, and snails can live up to 2 years!
Penny per Pick:
If you are like me, you hate to touch those slimy things. Why not pay a neighbor child a penny per snail to pick them out? If you know anyone with chickens the birds will love them too.
Save Your Egg Shells:
Crush up your egg shells and sprinkle them under and around your plants. The sharp edges will cut into the snails' underbelly and they will slime the other way. Wood ashes work too.
Beer or No Beer?
Beer is often a remedy to attract and rid snails, but if you have animals, they will also enjoy the stuff. When you can, sprinkle salt around your patio garden to keep the snails away. In the garden you can sprinkle pet safe snail pellets. The cost is about $5 per pound. "Sluggo" brand snail bate is the best.
Give the slimy critters vinegar shower (1 part vinegar to 1 part water). This is helpful when snails are wedged into small spaces of plants; such as the crevices of the artichoke plant.