I live in slug paradise (aka Portland, Oregon) and the slimy little creatures are having their way with my garden right now. The leaves of my hostas, cauliflower and lettuce are shot through with holes and I find slugs creeping their way across the patio whenever I step outdoors. This week I'm striking back with my organic arsenal of slug fighting tools.
Spring is prime slug and snail season because they love wet, cool weather and plants with young, succulent foliage. Seedlings that are just emerging from the soil and plants like hostas, lettuce, and basil are particularly vulnerable. Slugs and snails can annihilate a row of baby greens overnight and heavy slug damage often permanently stunts or disfigures plants. Luckily, the slimy creatures are easy to control with organic slug baits. These products contain iron phosphate, which causes the slugs and snails to lose their appetite when they ingest it. Eventually they die of starvation (not poisoning). The ridiculously named Sluggo and Escar-go are two common brands. The organic baits often take a couple of days to take effect, so use the following strategies in the interim:
Go hunting. Slugs and snails tend to congregate in dark, damp, cool spots like the edge of lawns, under logs or mulch, and around the sides of raised beds. Look for them in early morning. Drown any you find in a jar of soapy water and then toss them on your compost pile. Try crumpling up a piece of newspaper and placing it into the garden at night. Slugs often hide out in the paper and you can just pick it up and toss it in the trash in the morning. I also avoid mulching in my vegetable garden until the weather warms up and the soil surface stays pretty dry.
Feed them to the birds. If you have chickens, let them loose into the garden before planting in spring to gobble up slugs and weeds. During the garden season I hunt for slugs and snails and toss them into the chicken run as a snack for our hens.
Attract ground beetles. Slug eggs are a ground beetle's favorite meal. Lure these good bugs to your garden by planting low, perennial plants that provide shelter, such as ornamental grasses, oregano, and thyme.
Make beer traps. Slugs and snails are drawn to the yeasty smell of beer like college kids are to a keg. To make a beer trap, simply bury a shallow container, such as a yogurt or keg cup, in the garden. Leave the rim of the container one inch above the soil line to prevent ground beetles from accidentally falling in. The slugs will smell the beer, crawl right into the container and drown. Simply dump the contents onto your compost each morning and refill the cup. I've found the cheaper the beer, the better it works. In fact, we once used up an entire batch of bad home brew in slug traps. It tasted terrible to us, but the slugs didn't seem to mind.
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Willi Galloway writes The Gardener column. She lives in Portland, Oregon and writes about her kitchen garden on her blog DigginFood. Her first book Grow. Cook. Eat. A Food-Lovers Guide To Kitchen Gardening will be published in January 2012.
(Images: All images by Willi Galloway)






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Once we started gardening biodynamically, we stopped having any pest problems including slugs and snails (snails had been prevalent before), however now after having gone vegetarian I'm looking for a vegetarian version.
Another way, that helped us defeat slugs and snails, was to wrap the tops of raised beds and also trees in copper tape.
I second the use of copper - we just salvaged some wire and wrapped it directly around the base of plants, which worked well for upright things like basil.
The other thing we found helpful was to discourage them with mulch. We also got results with eggshells at the base of plants, and with Escar-Go which is an iron supplement that you add to the soil. Basically they're wimpy and will avoid anything that makes them unhappy. Once you eliminate conditions they like, they're not so pesky.
I also live in Portland and last year we had a terrible invasion of slugs. We did EVERYTHING listed here!....copper, beer, sluggo...after using a combination of all the things, the slugs were gone! I think the Sluggo definitely worked best. I also hear lite beer is more favored by slugs and that coffee grinds are not liked by slugs, but we haven't tried that yet though.
It's gross and kinda creepy, but you can also trick/pay neighborhood kids to kill 'em for ya. A spray bottle with half ammonia and half water is less damaging to plants than salt, and if you set the spray nozzle to fire like a trigger instead of misting all over, the fumes aren't too bad. My friends and I used to LOVE getting a penny per slug killed (honor system). Our neighborhood kids also delight in squiggly slimy death dances, so I'm thinking we might pay them to commit mass sluggicide on our turf too.
ginnielizz, I find that disturbing. No way I be rewarding kids for killing anything, much less teaching them to enjoy it.
eternalvoyageur I am vegan and generally opposed to killing anything, but when it comes to slugs that guzzle everything in my garden I have no mercy. So ginnielizz's sluggicide holds some real appeal for me. Besides they are non-native in North America so the less we have the better.
Rucy and MaryWynn--I'm interested that you guys had good luck with copper. I've used it before with mixed results in my garden. It seems that big slugs will crawl over the copper, perhaps because we have such HUGE slugs here in PDX. I'll have to give copper another try!
I love to use beer traps towards the center of my raised beds. However, my first line of defense are my team of ducks. Not only are they adorable as they waddle around on patrol, but they keep the slugs from ever getting into the beds. I don't let my chickens do this work because they will destroy a bed of lettuce in a matter of minutes. Ducks don't really munch on the people food. My next natural helper that I will add this summer are Guinnea Hens. They snap bugs right out of the air. I am hoping they help with flies and such near the goat yard.
Ducks rock for slug management...and you get eggs to boot!