- 1). Eliminate places where the slugs can hide out of the sun during the day, such as debris, ivy, leaves, stones and weedy areas around the base of trees. Place flowerpots upside down around the garden, with one end on a rock or brick. This encourages the slugs to hide in the shade under the flowerpots, so you can easily find and dispose of them, before they attack the lettuce.
- 2). Dig small holes about 10 feet apart in the garden. Put small plastic containers filled with beer in them. The slugs will go in for a drink and die. Empty the containers each morning and refill them with fresh beer.
- 3). Place crushed eggshells or coffee grounds around the base of your lettuce. Slugs don't like to crawl over rough surfaces.
- 4). Place slug bait with the ingredient metaldehyde on the soil around the garden to kill the slugs. They will die in about three days.
- 5). Place a barrier of copper around the lettuce crop. When slugs crawl on copper, their slime causes a chemical reaction and they experience a type of electric shock. You can also glue copper pennies to a board and place it around the lettuce.
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