Slug and Snail Control for Hostas: How to Choose a Bait or Barrier
Hostas are on UC IPM’s list of plants slugs and snails favor, and the damage is easy to recognise: irregular holes in the leaf blade, ragged edges, and silvery slime trails on the leaves and soil in the morning. This guide compares the main kinds of product sold for it — iron baits, a bait with an added insecticide, metaldehyde, and copper barriers — using what is printed on their labels and what extension services advise. If the damage is moderate, start with the free measures at the end of the page; extension guidance is clear that bait alone does not solve the problem.
How to choose
- Active ingredient and who else uses the bed. UC IPM says metaldehyde baits are “particularly poisonous to dogs and cats”, that the pellets can attract dogs, and that they should not be used where children and pets could reach them. It describes iron phosphate baits as safer for use around children, pets, birds and other wildlife. That is UC’s comparison, not a claim that any bait is harmless: the ASPCA notes that iron baits can also poison a pet that eats enough.
- Damp beds. Hosta beds are shady and moist. The Sluggo label says it remains effective after rain or sprinkling; OSU Extension says metaldehyde products do not work when wet and need reapplying.
- Where the label lets you put it. Iron baits may be scattered around plants. The metaldehyde label we checked allows only a barrier line, prohibits broadcast use, and requires keeping children and pets out of the treated area.
- How much area you need to cover. Label rates decide how many pounds you need; they are in the table.
- Whether it also kills insects. Spinosad (in Sluggo Plus) widens the range of pests and adds risk to bees and earthworms.
- OMRI listing if you garden organically. Check the current certificate, not only the bag.
- For copper, the width. UC IPM recommends a 4–6 in band of copper; most garden-shop strips are narrower.
Comparison
| Product | Active ingredient | EPA Reg. No. | OMRI | Label rate | Reapply | Label precautions |
|---|---|---|---|---|---|---|
| Monterey Sluggo | Iron phosphate 1.0% | 67702-3-54705 | Listed (lgp-0598), certificate to 1 Jun 2027 | 0.5–1 lb per 1,000 sq ft, or 1 level tsp per sq yd; 6-in band around ornamentals | As bait is eaten or at least every 2 weeks | Caution: moderate eye irritation. Store away from children and domestic animals. |
| Monterey Sluggo Plus | Iron phosphate 0.97% + spinosad 0.07% | 67702-24-54705 | Listed (lgp-2870), certificate to 1 Jun 2027 | 0.5–1 lb per 1,000 sq ft | Max 3 times in 30 days; after heavy rain | Caution: moderate eye irritation. Maker: do not leave an open container where pets can reach it. |
| Corry's Slug & Snail Killer | Sodium ferric EDTA 5% | 67702-33-8119 | Not claimed | 1.75 lb treats up to 8,750 sq ft (about 0.2 lb per 1,000 sq ft) | As bait is eaten or every 2 weeks | Caution: moderate eye irritation. Maker: people and pets may enter right after application. |
| GONZO Copper Stopper barrier tape | None (copper barrier) | Not a pesticide | Not applicable | One unbroken strip around the pot or bed | Replace if it lifts or corrodes | No pesticide |
| Metaldehyde bait (e.g. Southern Ag Snail & Slug Bait) | Metaldehyde 3.25% | 71096-7-829 | Not claimed | Barrier only: 20 pellets per linear foot; broadcast prohibited | At least 21 days apart, max 6 per season | Label: may be fatal to dogs and other domestic animals; use prohibited unless children and pets can be kept out. No antidote. |
Products
Monterey Sluggo
Iron phosphate 1.0% pellets. Slugs stop feeding after eating the bait and die over the following days.
Suits: Hosta beds that pets, birds or other wildlife also visit, and gardeners who want an OMRI-listed product.
Limits
- The label says slugs begin to die within three to six days and are often not seen dead, so the effect is easy to underestimate.
- UC IPM: baits alone will not control slugs and snails in the long term; combine with the steps under “When you do not need to buy anything”.
- Garden Safe Slug & Snail Bait is sold under the same base EPA registration (67702-3) with the same 1% iron phosphate — treat it as an alternative, not a different product type.
What we could not confirm
- We could not query the OMRI database directly; the OMRI status above is from the certificate the manufacturer publishes (expires 1 June 2027).
Sources: Sluggo product page and label (Monterey) ; UC IPM Pest Note: Snails and Slugs
Amazon listing checked 2026-10-05: “Monterey Sluggo Snail & Slug Killer Bundled with Measuring Spoon - OMRI Listed for Organic Gardening - Wildlife and Pet Friendly - 1 lb Shaker can” (ASIN B005ZDU548)
Check on Amazon Affiliate link
Monterey Sluggo Plus
Iron phosphate 0.97% plus spinosad 0.07%. The spinosad adds earwigs, cutworms, sowbugs, pillbugs and crickets to the label.
Suits: Beds where earwigs or cutworms are chewing hosta leaves as well as slugs.
Limits
- It kills more than slugs. NPIC describes spinosad as very highly toxic to bees (with little effect once sprays have dried) and moderately toxic to earthworms; those figures are for the active ingredient in general, not for this bait.
- Label: no more than 3 applications in any 30-day period; reapply after heavy rain or watering.
What we could not confirm
- We found no toxicity data specific to spinosad bait pellets as opposed to sprays.
Sources: Sluggo Plus product page and label (Monterey) ; NPIC Spinosad general fact sheet
Amazon listing checked 2026-10-05: “Monterey Sluggo Plus Bundled with Measuring Spoon - Snail & Slug Killer, Plus Controls Other Insects, OMRI Listed for Organic Gardening - 1 lb” (ASIN B0DS2R7W4S)
Check on Amazon Affiliate link
Corry's Slug & Snail Killer
Sodium ferric EDTA 5% bait. Corry's used to be a metaldehyde brand; the product sold now is an iron compound.
Suits: Gardeners who want an iron-based bait that works faster than iron phosphate — UC IPM says ferric sodium EDTA baits kill snails in about three days instead of seven.
Limits
- The manufacturer does not claim an OMRI listing.
- The safety data sheet we found is dated 2016; the brand now belongs to Central Garden & Pet.
What we could not confirm
- OMRI status — not claimed, not confirmed.
Sources: Corry's product page ; Corry's SDS
Amazon listing checked 2026-10-05: “Corry's Slug and Snail Killer Bait 1.75 Pounds” (ASIN B001M5CEFQ)
Check on Amazon Affiliate link
GONZO Copper Stopper barrier tape
Adhesive copper strip, 1.75 in × 30 ft, with no pesticide. Slugs avoid crossing copper.
Suits: Hostas in pots and the rims of raised beds, where a strip can run unbroken around the whole edge.
Limits
- At 1.75 in it is narrower than the 4–6 in copper band UC IPM recommends, and OSU Extension says most copper strip sold in garden shops is not wide enough. Expect partial protection at best.
- The maker states it is not for sale in California.
What we could not confirm
- Copper thickness and how long the adhesive lasts outdoors.
Sources: GONZO 9000 product page ; OSU Extension: Managing slugs and snails
Amazon listing checked 2026-10-05: “GONZO Copper Stopper Slug and Snail Barrier Tape 30 Feet - Non-Toxic Slug & Snail Repellent - Pet Safe - Plant Guards for Potted Plants - Pack of 1” (ASIN B0977Z5G9Z)
Check on Amazon Affiliate link
Why there is no metaldehyde pick
Metaldehyde baits are legal and the label rate is in the table, but the label itself says the product may be fatal to dogs and other domestic animals, that there is no antidote, that it is toxic to birds and must not be used near water, and that it may harm daylilies and clematis — plants often grown next to hostas. Veterinary sources (VCA, ASPCA) describe tremors and seizures within minutes to hours of a pet eating it. Iron baits do the same job in a hosta bed with fewer of these restrictions, so we do not link to a metaldehyde product.
When you do not need to buy anything
- Remove daytime hiding places. UC IPM: clear weeds, boards, stones and pots where slugs shelter. Mulch is also a hiding place; OSU suggests turning it over and clearing debris.
- Water in the morning, not the evening, so the bed surface dries before night (UC IPM, OSU).
- Hand-pick at night with a flashlight on a regular schedule — UC IPM calls this “very effective if done thoroughly”.
- Board traps: 12 × 15 in boards raised on 1 in runners, scraped each morning (UC IPM).
- Beer traps work only within a few feet and need refilling every few days (UC IPM); set the rim at soil level and check daily (OSU).
- Choose thick-leaved hostas. The American Hosta Society describes ‘Halcyon’ as having “thick leaves, demonstrating good slug resistance” and ‘Sum and Substance’ as “slug resistant”; see the Hosta of the Year list.
Sources
- University of California IPM, Pest Notes: Snails and Slugs (Pub. 7427).
- Oregon State University Extension, Managing slugs and snails.
- National Pesticide Information Center, Spinosad general fact sheet.
- ASPCA, What pet dangers are in your garage; VCA, Metaldehyde toxicity.
- Product labels and pages as linked in each card. Checked 2026-10-05.