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You need to identify theYou need to identify the pest.  Go out very late at night or very early in the morning with a flash light and look for slugs, a common culprit. if you see slugs, you can put slug pellets and crush eggshells around the base of the plant. If it's not slugs, look carefully at the plant. Are the leaves being eaten? Large holes or small holes?  Describe the damage as different pests chew plants in different ways.

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