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Live mealworms are the better food; dried mealworms are the more practical one. Live worms are full of moisture, wriggle (which robins and blackbirds find irresistible) and are closest to the natural insect diet. Dried worms are cheaper, keep for months and need no care — but they should be soaked in warm water before feeding, especially in the breeding season, and kept well away from hedgehogs.
- Moisture: live mealworms are roughly 60% water; dried ones under 10%.
- Shelf life: live — a few weeks in the fridge; dried — months in a sealed tub.
- Top fans: robins, blackbirds, dunnocks, wrens, starlings and tits.
- Always: soak dried mealworms for 15–30 minutes in spring and summer.
- Never: leave dried mealworms where hedgehogs can reach them.
What mealworms actually are
Mealworms aren’t worms at all. They are the larvae of the darkling beetle (Tenebrio molitor), farmed on bran. That matters because they are a genuine insect food, the closest thing a garden feeder can offer to the caterpillars, grubs and beetle larvae birds hunt for themselves. Seed eaters like finches will ignore them; insect eaters like robins will be on your hand within weeks.
Side-by-side comparison
| Live mealworms | Dried mealworms | |
|---|---|---|
| Water content | High — natural hydration | Very low — soak before use |
| Attraction | Movement draws birds in fast | Slower to be discovered |
| Cost per feed | Higher | Much lower |
| Storage | Fridge, ventilated tub, 2–4 weeks | Cupboard, airtight tub, months |
| Effort | Occasional feeding with bran and a slice of apple or carrot | None beyond soaking |
| Best for | Breeding season, taming robins | Everyday top-up, bulk feeding |
| Hedgehog risk | Low in small amounts | Keep out of reach |
The case for live mealworms
Live mealworms win on nutrition and appeal. The moisture inside each worm is a real benefit in dry spells and especially when adults are feeding chicks, because nestlings get much of their water from food. The wriggling triggers the hunting instinct of ground-feeding insect eaters, so a dish of live worms is usually found within a day or two, where dried ones can sit untouched for a week.
They are also the classic way to hand-tame a robin. Start with a dish in the same spot at the same time each day, then sit nearby, then hold the dish, then the palm. Live worms speed that up considerably.
The case for dried mealworms
Dried mealworms are cheaper, easier and don’t die in the post. You can buy a large bag, keep it in a sealed tub and scatter a handful whenever you like. Starlings, blackbirds and tits all take them readily once they’re used to them, and mixing dried worms into suet or softbill food makes it go further.
The downside is dryness. A bird filling up on bone-dry worms in hot weather, or stuffing them into chicks, is getting very little water. That’s why soaking matters.
How to soak dried mealworms
- Put a day’s portion in a bowl — about a tablespoon per feeding spot.
- Cover with warm (not boiling) water.
- Leave 15–30 minutes until plump and soft.
- Drain and put out the same day. Soaked worms spoil quickly, so throw away leftovers by evening.
Tip: in winter, dry mealworms are fine unsoaked — birds need energy more than water, and wet food can freeze on the dish. Soak from roughly March to September.
The hedgehog warning
Hedgehog rescues report that hedgehogs will gorge on dried mealworms, and a diet heavy in them has been linked to metabolic bone disease because of the poor calcium-to-phosphorus balance. Put dried mealworms on a raised table or in a hanging dish, take any leftovers in before dusk, and feed hedgehogs meaty cat or dog food or specialist hedgehog food instead.
How to feed either kind
- Use a dish with drainage holes or a dedicated mealworm feeder with steep sides so live worms can’t climb out.
- Little and often — a small handful twice a day beats a big pile that attracts rats.
- Keep it clean. Current RSPB guidance is to clean feeders weekly and move them regularly. Avoid flat surfaces where birds stand in the food.
- Pick a spot near cover — robins and dunnocks like a hedge or shrub within a short hop.
Keeping live mealworms alive
Store live mealworms in a ventilated tub in the fridge (around 5–8°C) with a layer of bran. Once a week, bring them to room temperature for a few hours and add a slice of apple or carrot for moisture, then remove it before it moulds. Kept this way they last several weeks. If they turn into pupae or beetles, they’ve been kept too warm.
Our verdict
Use both. Keep a tub of dried mealworms as your everyday staple, soak them through spring and summer, and buy a small batch of live worms for the breeding season or when you want to win over a robin. That gives birds the best of both without the cost of feeding live worms all year.
Common questions
Are dried mealworms bad for birds?
No, they’re a good supplementary food. The only concern is dryness in warm weather and during nesting, which soaking solves.
Can I feed mealworms in summer?
Yes. Current RSPB guidance lists mealworms among the foods that can be offered year-round, alongside suet and fat balls, while seed and peanuts are paused from May to October.
Why are birds ignoring my mealworms?
Dried worms have no movement to catch attention. Put a few live ones in with them for a week, or place the dish where robins already forage. Most birds find them within a fortnight.
How many mealworms should I put out?
A small handful per feeding spot, once or twice a day. If there are leftovers at dusk, you’re putting out too many.
Are UK-farmed mealworms better?
Many dried mealworms are imported. UK or EU-farmed live mealworms are widely available from bird-food suppliers if provenance matters to you.
Related guides
- Robin: the UK’s favourite garden bird
- When to feed garden birds through the year
- What eats bird food at night?
Sources: RSPB garden bird feeding guidance (April 2026 update); British Hedgehog Preservation Society guidance on feeding hedgehogs; BTO Garden BirdWatch.
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