Greg Ro wrote:

Put the beer in some throw away plastic bowls.
Put one bowl close to the each group of flowers.

You need to bury the bowls enough so the slugs can climb into the bowls.
Traps containing beer or other fermenting food are popular. You can
purchase commercially available slug traps or make your own. Sink jars,
cans, pans or similar containers into the ground so the top is level
with the ground (some commercially available traps are placed on the
ground). Pour beer or a water and yeast mixture (one teaspoon of yeast
to three ounces of water) or similar fermenting liquid into the
container. Slugs are attracted to the odors, fall in and drown.

Diatomaceous earth (tiny fossilized skeletons of ancient aquatic
diatoms) or sharp sand is moderately effective as a slug barrier. When
slugs come in contact with diatomaceous earth or sharp sand, it is
abrasive to their skin. Diatomaceous earth is most effective when used
in dry conditions and has little effect when it absorbs moisture.

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