Seedlings Disappearing Overnight: What's Taking Them?

Seedlings that vanish overnight are usually felled by cutworms, eaten entirely by slugs, pulled up by birds, or clipped by rabbits — and sometimes they were killed by damping-off fungus rather than eaten at all. What's left behind decides it: a toppled stem means cutworms, slime trails mean slugs, a pinched wilted stem means fungus, and nothing at all usually means slugs or a bird.

Most likely causes

  • Cutworms — seedling severed at the soil line, top left lying beside the stub
  • Slugs — the whole seedling gone, with slime trails as the only evidence
  • Birds — sprouts plucked or pulled up, sometimes left wilting on the surface
  • Damping-off fungus — stem pinched and darkened at soil level, seedling collapsed in place
  • Rabbits — rows of seedlings clipped off cleanly, pellet droppings nearby

Compare the possible causes

Possible cause Key signs When it happens How likely
Cutworms Stems cut cleanly at or just below the soil surface, often with the severed top abandoned next to the stump Spring, typically the first two to three weeks after seedlings emerge or are transplanted Very common
Slugs and snails Seedlings gone entirely — sometimes down to the soil — with silvery dried slime trails on the bed or nearby mulch Mild, damp nights in spring and fall; damage peaks after rain Very common
Birds Sprouts tugged out of the ground, seed pieces dug up, or seedlings snipped and left wilting on the surface Early morning, right at germination time in spring Common
Damping-off fungus Seedling collapsed in place with a darkened, pinched, threadlike section of stem right at the soil line Cool, wet conditions in early spring, especially in overwatered trays and dense sowings Common
Rabbits Multiple seedlings clipped off cleanly at a 45-degree angle in one night, often a whole row, with round pea-size droppings nearby Dusk, dawn, and overnight, spring through summer Common

Visual clues to check

  • Examine the stub: a stem cut at soil level with the top left behind means cutworms; a clean angled cut with the top gone means rabbits
  • Look for slime: shine a flashlight across the bed at night or check for dried silvery trails in the morning
  • Dig a quick circle: sift the top inch of soil within 4 inches of a felled seedling — cutworms curl into a gray-brown C when exposed
  • Check the stem base on collapsed seedlings: dark, pinched, threadlike tissue means damping-off fungus, not an animal
  • Note the pattern: losses marching down a row night by night suggest cutworms or rabbits; a spreading patch of collapsed seedlings suggests fungus
  • Watch at first light: birds pulling sprouts work at dawn and leave scratch marks and beak-pulled seed hulls
  • Count the droppings: clusters of round pea-size pellets in or beside the bed point to rabbits

The causes in detail

Cutworms

Cutworms are soil-dwelling caterpillars that girdle tender stems at night and hide in the top inch of soil by day, usually within a few inches of their latest victim. The telltale detail is waste: they fell the seedling but eat only a little of it, leaving the top on the ground. They tend to work down a row, taking one or two plants per night, which is why gardeners lose a whole planting over a week.

Slugs and snails

A seedling is a single mouthful for a slug, so where an older plant would show chewed leaves, a sprout simply ceases to exist. Slugs shelter under mulch, boards, pots, and dense groundcover by day and can travel several feet to feed. If beds are mulched and the weather has been wet, slugs should be your first suspect for total disappearances.

Birds

Sparrows, finches, and crows treat a freshly sprouted bed as a buffet — some eat the tender shoots, while crows and jays pull sprouts to get the seed still attached below. Pea, bean, corn, and sunflower seedlings are favorite targets. Because birds work in daylight, an early-morning watch or a look for small triangular beak marks and scratching often confirms them.

Damping-off fungus

Damping-off isn't a pest — it's a group of soilborne fungi and water molds that rot seedling stems where they meet the soil, making the plant keel over as if cut. Unlike cutworm damage, the stem is still attached but shriveled to a dark thread, and victims often appear in a spreading patch rather than a neat row. Once a seedling wilts from damping-off it cannot be saved, but better airflow, lighter watering, and clean seed-starting mix protect the rest.

Rabbits

A rabbit can erase an entire row of bean or lettuce seedlings in a single visit, and unlike cutworms it eats what it cuts — you'll find stubs but no discarded tops. The angled, almost razor-clean cut and scattered droppings distinguish rabbit work. Once a rabbit finds a productive bed it returns nightly, so fencing sooner beats replanting later.

When to worry

  • Losing seedlings every single night — an active cutworm or resident rabbit will continue until stopped
  • Collapsed seedlings spreading outward through a tray or bed within days, which means damping-off is moving through your starts
  • Entire rows gone in one night, pointing to a rabbit or groundhog with regular access to the garden
  • Repeated replantings vanishing at the same growth stage — replanting without protection just feeds the problem

What to do now

  1. Put a collar around each seedling — a toilet-paper tube, foil ring, or cut cup pushed 1 inch into the soil and rising 2–3 inches above it stops cutworms cold
  2. Trap slugs with a board or overturned melon rind laid on the soil overnight, then collect what's underneath each morning
  3. Cover freshly seeded beds with floating row cover or netting until plants are a few inches tall — it blocks birds, rabbits, and most insects at once
  4. Water seedlings in the morning and thin dense sowings so stems dry quickly, which stops damping-off from spreading
  5. Start over with fresh sterile seed-starting mix and clean containers if damping-off wiped out a tray
  6. Fence the bed with 1-inch mesh, 2 feet tall and buried a few inches, if rabbit signs are present
  7. If losses continue despite collars, covers, and fencing, your county extension office can identify the culprit from photos and soil samples

What not to do

  • Don't replant into an unprotected bed — whatever ate the first sowing is still there and will eat the second
  • Don't drench beds with insecticide on suspicion; if the real problem is fungus, birds, or rabbits, the spray does nothing and harms soil life
  • Don't reuse potting mix or dirty trays from a damping-off outbreak without cleaning them — the fungus carries over
  • Don't sprinkle salt to kill slugs near your beds; it damages soil and plants
  • Don't rely on daytime inspections alone — nearly every seedling thief on this list works at night or dawn

Think you know the suspect?

These animals commonly cause this clue — see their full sign profiles:

Frequently asked questions

What eats seedlings but leaves the stem?

That's the signature of cutworms. They chew through the stem at the soil line at night, topple the seedling, and eat surprisingly little of it — the discarded top lying next to a stub is the classic scene. Look for the fat, C-curled caterpillar in the top inch of soil nearby and protect remaining plants with collars.

Why did my seedlings vanish without a trace?

Total disappearance usually means slugs, which can consume an entire small seedling in one night, or birds that pulled the sprout out to reach the seed. Check for dried slime trails in the morning and for beak marks or scratching in the soil. A night flashlight check will usually catch slugs in the act.

How do I tell cutworm damage from damping-off?

Look at the stem. A cutworm severs it completely, leaving a cleanly cut stub and a detached top. Damping-off leaves the seedling attached but collapsed, with a darkened, pinched, water-soaked section of stem at soil level. Cutworm losses also march down a row, while damping-off spreads in a patch.

Do coffee grounds or eggshells protect seedlings from slugs?

Not dependably — studies and gardener trials show slugs cross both barriers when motivated. Physical protection works better: collars for cutworms, row cover or netting for birds and rabbits, and nightly board traps to reduce the slug population directly.

Related yard clues

Plant Damage Plant Stems Cut Near the Ground: Cutworms or Rabbits? A seedling toppled with its stem severed right at the soil line is the classic signature of cutworms, night-feeding caterpillars that curl in the soil by day. Clean 45-degree cuts a few inches higher point to rabbits, while stems gnawed through at the base — often with the plant left uneaten — suggest voles or, less often, squirrels. Read the guide → Plant Damage Flowers Eaten Overnight: Who Raided Your Garden Beds? Flowers that vanish overnight are most often deer or rabbits, and which flowers were taken narrows it fast — tulip and hosta blooms nipped off whole point to deer, while low plants clipped at a clean angle point to rabbits. Petals riddled with ragged holes but still attached usually mean earwigs or slugs working after dark, and shredded rose blooms are Japanese beetles feeding into dusk. Read the guide → Plant Damage What Is Eating My Pepper Plants? How to Identify the Pest Pepper plants are most often eaten by hornworms, slugs, flea beetles, aphids, or cutworms — and if entire tops or whole plants disappear, rabbits or deer. The pattern of damage tells you which one: tiny pinholes point to flea beetles, big ragged missing chunks to hornworms, slime trails to slugs, and clean angled cuts to a four-legged visitor. Read the guide → Yard Holes Holes in Flower Beds Overnight? Meet the Night Shift Flower beds dug up overnight are almost always animals hunting food, not making homes: skunks and raccoons dig for grubs and worms in the soft soil, squirrels bury and retrieve nuts, cats use loose beds as litter boxes, and across the South armadillos root through beds nose-first. Each leaves a different style of hole, so one careful morning inspection usually names your visitor. Read the guide →

Still not sure? Compare with these clues

Plant Damage What Is Eating My Tomato Leaves at Night? Tomato leaves that disappear overnight are most often the work of tomato hornworms, cutworms, slugs, or flea beetles — and if whole branches are gone, rabbits or deer. The size of the bites, whether there are slime trails, and how low on the plant the damage sits will point you to the culprit, and a ten-minute flashlight check after dark usually confirms it. Read the guide → Plant Damage Something Digging in Potted Plants? Here's the Likely Culprit Something digging in your potted plants is most often a squirrel burying or retrieving nuts — the number one cause by far — followed by chipmunks, birds taking dust baths, raccoons hunting grubs at night, or a cat using the pot as a litter box. Daytime digging with small neat pits points to squirrels; pots trashed overnight point to raccoons. Read the guide → Plant Damage Leaves Chewed From the Edges: How to Read the Bite Marks Leaves eaten inward from the edges are usually caterpillars, grasshoppers, or — if the edges show neat crescent-shaped notches — adult weevils feeding at night. When whole leaf sections or stems are missing, the cut itself is the clue: a clean angled snip means rabbits, while ragged torn edges mean deer. Read the guide →