Hosta: holes eaten in leaves

What it is likely to be on hosta

1. Slugs and snails

   Candidate 1very common on this plant

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Slugs and snails

   Checked 2026-08-13

   The most destructive garden pest in a wet British spring, and the one surrounded by the most confidently repeated advice that does not work. They shred seedlings overnight and leave irregular holes with slime trails nearby.

   Points towards it

   • · a dried slime trail is conclusive and nothing else leaves one
   • · damage starts on the lowest leaves, nearest the ground the slugs come from
   • · an outdoor problem almost entirely

   Argues against it

   • · slugs are not an indoor problem in any normal circumstance — this rules it out entirely.

   Check this next

   Go out after dark with a torch and look at the underside of the leaves and the soil around the crown. Slugs feed at night, so an inspection at midday finds the damage and never the animal.

   What to do now

   Check at night and remove what you find, and clear the leaf litter and pot bases they shelter under during the day. On hostas, moving the plant into a container raised off the ground removes most of the pressure without any treatment at all.

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Slugs and snails — control

   Checked 2026-08-13

2. Vine weevil

   Candidate 2common on this plant

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Vine weevil

   Checked 2026-08-13

   Two quite different kinds of damage from one insect. The adults cut characteristic notches from leaf margins, which is unsightly and rarely serious; the grubs eat the roots underground, which kills the plant without any warning above ground until it collapses. Container plants are far more affected than open ground.

   Points towards it

   • · neat semicircular notches cut inwards from the leaf margin are vine weevil
   • · container-grown hostas are where it is worst

   Argues against it

   • · slime means slugs, which chew irregular holes rather than neat notches — this rules it out entirely.

   Check this next

   Look at the outline of the damage rather than its quantity. Vine weevil cuts neat semicircles inwards from the edge, as if with a hole punch, and never holes in the middle of the leaf — and those notches matter mainly as a warning that grubs may be eating the roots below.

   What to do now

   Treat notched leaves as a signal to check the roots rather than as the problem. Tip a container hosta out and look for creamy white C-shaped grubs in the compost — those kill the plant, where the adults only spoil the leaves.

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Vine weevil — control

   Checked 2026-08-13

3. Slugs and snails

   Candidate 3very common on this plant

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Slugs and snails

   Checked 2026-08-13

   The most destructive garden pest in a wet British spring, and the one surrounded by the most confidently repeated advice that does not work. They shred seedlings overnight and leave irregular holes with slime trails nearby.

   Points towards it

   • · the trails dry silver across the leaf surface overnight
   • · the emerging shoots in spring are eaten before they unfurl, so the leaf opens already holed

   Argues against it

   • · a hosta indoors is out of reach of what eats it outdoors

   Check this next

   Look at the emerging spears in April rather than at the open leaves in July. Hosta damage is decided before the leaf unfurls: a slug eating a rolled shoot produces a row of holes that appear symmetrically across the open leaf, which is the signature of this plant and this pest together. Look under the pot and under the leaf skirt after dark to find them.

   What to do now

   Protect the crowns from March, before the shoots appear, rather than reacting in June when the leaves are already marked — the damage is done in a fortnight and lasts all season. Growing hostas in pots on a hard standing, and choosing the thick-leaved blue-grey cultivars, both reduce it substantially.

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Slugs and snails — cultural control

   Checked 2026-08-13

Narrow it down

This page lists everything at once, which is the right shape for reading and the wrong shape for deciding. The interactive tool asks one question at a time, starting with whichever would separate these causes fastest, and stops as soon as further answers would not help.

Opens with the plant and the symptom already set. Nothing you answer is stored or sent anywhere — the answers live in the address bar and nowhere else.

What this does not cover

These are the causes GrowingHQ holds rules for on hosta — not every cause there is. Where several problems look alike, the honest answer is often that they cannot be told apart by eye, and a page that named one would be guessing. If none of the above fits, the general holes eaten in leaves page lists causes across all plants, and the Hosta profile lists the problems it is prone to.