Learn / Ask The Landscape Professional
My Hostas have holes in the leaves, what's going on with them?
Looks like you have a slug problem; those shiny, slimy mollusks are a
gardener's worst nightmare. Slugs are similar to snails but without the
shell.They range in size from less than an inch long to longer than 4
inches. Slugs do their damage at night and hide in weedy borders of
yards and fields during the day. They eat all types of vegetation and
crops, but they especially like many varieties of Hostas, particularly
those that have thin leaves.You will see the largest number of slugs
and the most damage to your plants in August and September after
a wet summer.
So, what can you do?
First of all, do not use any chemicals. There
are chemicals in stores that kill slugs, but they kill dogs too. Just
because you can find them in the store, doesn't mean they are safe to
you, your kids, the environment or your pets.
Here are things you can safely do:
1. Look for and eliminate daytime hiding spots for slugs like weedy
edges of gardens,
2. Replace any large bark chip mulch or woodchips with shredded
bark mulch. Slugs hide under the large chips but not the shredded
3. Remove Pachysandra, Myrtle or any other ground covers that create a warm, moist hiding place that the
slugs can crawl under.
4. Slugs hate navigating over rough, dry surfaces. Surround your plant with inert rough materials: gravel,
sand, wood ashes, crushed egg shells or even lime (although lime lowers the pH of the soil, which may
be perfectly fine, it depends on your garden soil). Remember that the rain will tend to deplete whatever
you use so it will need to be replaced.
5. Dump the morning coffee in the slug area. The USDA has recently reported that slugs are killed with a
2% caffeine solution and even weaker solutions cause them to stop eating.
6. Slugs love beer! Well, actually, they love the yeast in beer. A favorite slug remedy is to dig a dish into the
ground so that the lip is even with the surface and fill it with beer or a solution of baker's yeast and water.
Nearby slugs will come for a swim and drown! You will have to place a number of these beer traps around
the area you want protected.
There are plenty of safe approaches to slug control, so when
you see a flashy store display touting
pesticides, walk right by, you know better!
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About Linda Lillie
Linda K. Lillie is the President of Sprigs & Twigs, Inc, the premier
landscape design and maintenance, tree care, lawn care, stonework, and carpentry
service provider in southeastern Connecticut since 1997. She is a graduate of
Connecticut College in Botany, a Connecticut Master Gardener and a national
award winning landscape designer for her landscape design and landscape installation work.