Deal with slugs and snails – naturally!

Slug eating a leaf

Every Spring season, it’s the same old story. You’re strolling through the garden, soaking in that frenzied feeling of nature waking up. Ka-POW, disaster strikes! Everywhere, slugs and snails chowing down on young sprouts, wispy stems standing as tiny totems to spirits of the past… Gone are your favorite flowers and vegetables! To make sure your sprightly Spring mood doesn’t swing up and down this much, follow these tips on how to control them naturally.

Know your enemy

There are two main types of slugs in our gardens. Common garden slugs (Arion hortensis) and large black or red slugs (Arion ater). Regarding snails, you’ll probably notice the garden snail (Helix aspersa) and, though less common, the garden banded snail (Cepaea hortensis) or the grove snail (Cepaea nemoralis).

Let’s look at the patterns in the life slugs and snails.

  • Mainly, they’re most active at night, but on rainy wet days they’re all over the place even during daytime.
  • To find them, simply follow their traces! Long trails of mucus on the ground often link back to cool, wet spots under stones, pots, slabs of bark or under mulch.
  • In general, they feed on whatever is directly at ground level. However, they’re perfectly capable of climbing on your plants to forage.

Symptoms of slug and snail attacks are generally stems cut about an inch high (2-3 cm), with leaves missing entirely. If you notice seedlings falling over or turning yellow, it’s “damping off” due to fungus.

How to fight slugs and snails

Decoy plants attract snails and slugs away from crops.The better you “know your enemy”, the easier it is to deal with it. The first step is thus to create a barrier between plant and ground: pick up fallen fruits and don’t let withered leaves trail back down to the ground. These are like bridges for the slimy little buggers. That way, the only way to climb the plant is the stem or trunk. Protecting that single point of entry is easier.

Beneficial animals

These will keep Gastropoda numbers down. Among the most voracious helpers, you’ll find hedgehogs, toads, and also nematodes which are microscopic worms that parasite and attack slugs. They’re sold in garden stores and look like powder. All that’s needed is to mix them into water and spray it all over the ground.

Plants can help, too

Certain plants naturally repel slugs: thyme, chives, fennel, comfrey, garlic, etc. Others such as chamomile tend to attract slugs to them. You can use it as a decoy to draw them away from your prized crops.

Natural barriers

Further protection is available through the use of natural barriers that discourage slugs and snails from devouring young sprouts. For instance, chimney ashes (if you have a fireplace), used coffee grounds, coarse sand or grit, and even crushed egg shells. The main drawback of these barrier techniques is that they’re washed out by rain. Therefore, they need to be replaced every time it rains.

Interestingly, snails and slugs absolutely hate slithering across copper, believe it or not! To that end, twist electric wire (after removing the plastic sheath) into a barrier you can wrap around stems or plants to create a natural anti-slug fence.

  • Some types of mulch have this “barrier” effect: cocoa hull, flax… Simply sprinkle a few handfuls after rains to prolong this barrier effect.

Natural slug and snail traps

Another possibility to deal with slugs and snails is to trap them. Two options here:

  • The passive trap, where you create an appealing shelter (stone, slab of wood, up-side down pot…) for the creatures to hide under at the end of the night. During the day, turn the trap over, pick out the animals, and exile them to a spot where they won’t cause as much damage.
  • The beer bait trap (very effective). Indeed, yeast attracts slugs, and they swim around in the trap until they drown. Remember to only use containers that keep other animals out, so that only slugs die.

Smart tip about slug and snail control

The goal of this article isn’t to learn how to eradicate and kill off all slugs and snails from your garden. They’re on Earth for a reason, and, in their own way, are very helpful in a garden. They work to convert plant waste into fresh nutrients that your plants can use to grow. Your garden, in the long run, will be better off with snails and slugs than without!

Snails gather at night in bark.


Credits for images shared to Nature & Garden (all edits by Gaspard Lorthiois):
Slug eating leaves by Helga under Pixabay license
Snail eating shrub by Tristan Honscheid under © CC BY 2.0
Snails in bark by Enrico Anger under Pixabay license