Asian hornet: how tits can protect bees in your garden

In a growing number of gardens, an invasive predator is causing concern: the Asian hornet. It preys on honeybees and other pollinators, potentially disrupting fruit harvests for home gardeners too. One small, familiar bird cannot solve the problem, but it can noticeably reduce its impact: the tit. Thinking about these birds as early as March can significantly shift the balance in your garden.

Why the Asian hornet puts our gardens under pressure

The Asian hornet is an invasive species that has spread across large parts of Europe since the early 2000s. It appears around beehives, traditional orchards and patios, where it consumes pollinating insects in considerable numbers.

A crucial process takes place out of sight during late winter and spring. Overwintering queens emerge, search for a suitable location and establish new nests. If they are not disturbed at this stage, their colonies can consume vast quantities of insects over the course of the year - several kilograms per colony.

“If you only respond once the large nests become visible in summer, you have already missed the decisive stage.”

Experts consider complete eradication highly unrealistic. These insects reproduce rapidly, while Europe has few natural predators, such as the European bee-eater or certain birds of prey. However, these species tend to occur only in particular regions or at certain times of year. In practical terms, they have little relevance in the home garden.

This is where another, much more common resident of built-up areas comes into play: the tit, particularly the great tit and blue tit.

Tits as allies: small birds with a big appetite for insects

Tits feed their young almost entirely on insects. Spring is an exceptionally busy period for them: they make trips every few minutes, filling their chicks’ beaks with every accessible caterpillar or larva. Over just a few weeks, this adds up to several thousand prey items.

If a hornet nest is within reach, its larvae may also become part of the menu. To a tit, it makes little difference whether the prey is a butterfly caterpillar or a hornet grub - what matters is that it is rich in protein.

• Each day, parent tits bring insects to their young hundreds of times.
• Across an entire breeding period, they collect several thousand larvae and caterpillars.
• This can include hornet larvae when an accessible nest is nearby.

Interestingly, great tits often nest close to hornet nesting sites or former nests. They feed there on dead insects and larval remains, especially in late autumn and winter. This further reduces hornets’ breeding success, as fewer new queens develop.

“Tits are not a miracle cure for the Asian hornet, but they apply constant pressure - quietly, unobtrusively and at no cost.”

Researchers also stress that no single bird, insect species or plant will control the hornet on its own. What is needed is a combination of many small measures. Tits are one of those elements - and one of the most practical ones for a home garden.

How to attract tits to your garden at the right time

For a bird to support your bees, it needs one thing above all: somewhere to live. Natural tree cavities have become scarce in residential areas. March is the key month, as the competition for nesting sites begins then.

The right nest box: dimensions, height and position

A simple wooden nest box is entirely sufficient, but a few details matter:

• Entrance hole: around 2.5 to 3 centimetres in diameter - large enough for tits but too small for larger unwanted visitors.
• Height: 2 to 5 metres above ground level, depending on the tree or wall.
• Direction: avoid the prevailing wind; an east- or south-east-facing position is preferable.
• Safety: keep it away from routes cats can use to climb up, and avoid intense direct sun in high summer.

Timing is important. Hanging up the box before mid-March gives you a far better chance of attracting a breeding pair of tits. Those who wait until April are usually too late, as territories will already have been claimed.

Late-winter food and insect abundance in spring

Tits also need food to feel at home in the garden. A simple rule of thumb can help with planning:

• Until the end of March: provide sunflower seeds, nuts and vegetable fats as an energy source after winter.
• From spring onwards: gradually reduce feeding stations so that birds switch to hunting insects.

Providing nothing but seeds throughout the year makes the birds less active in their search for insects - including hornet larvae. The aim is to create a garden where birds catch the main part of their food for themselves.

Plants, water and no chemicals: making a garden friendly for tits

A lively, slightly “untidy” garden provides far more food than a sterile gravel garden. The following features are particularly helpful:

• Hedges and shrubs: elder, hawthorn and hazel, for example, provide insects, berries and shelter.
• Wild corners: piles of leaves, brushwood and unmown areas support countless small creatures.
• A water source: a shallow dish or small pond, cleaned and refilled regularly.
• No pesticides: poisons affect insects first, then insect-eating birds such as tits.

“Every spraying treatment avoided and every wild square metre of garden increases the chances that tits will find enough prey for their chicks in spring.”

Tits are protected species under the law. Nest boxes that are visibly occupied should therefore be left alone. Do not open them out of curiosity or move them during the breeding season, as disturbance at the nest can cause birds to abandon a brood.

What tits can do against the Asian hornet - and what they cannot

Supporting tits helps build a kind of safety net for your own garden. They destroy hornet larvae, pick caterpillars from fruit trees and eat aphids from shoots. This reduces pest numbers and relieves pressure on pollinators.

Nevertheless, this does not replace professional handling of hornet nests. A strong colony can be dangerous to people, particularly those with allergies. If you find a nest, you should:

• not attempt to tackle it yourself,
• not damage it with poles or water,
• always report it to trained professionals.

Tits can curb the spread of the Asian hornet at several points, above all by eating larvae and thereby reducing the number of potential new queens. When this happens in many places at the same time, the overall burden on bees and other pollinators is noticeably reduced.

Practical tips for beekeepers and home gardeners

Beekeepers can benefit from the “tit effect” too. Useful measures include:

• at least one nest box near the apiary, positioned at a safe distance from hive entrances,
• hedge-style planting around the site, offering cover for both insects and birds,
• a small pond or drinking station with shallow escape routes.

Beekeepers who previously had no tits nearby often report greater bird activity after just one or two years - as well as, subjectively, less pressure from hornets in the immediate vicinity of their hives. This is no substitute for monitoring, but it can form part of a wider package of measures.

The effort is equally worthwhile in purely ornamental gardens. Marking the calendar to clean the nest box by February at the latest and put it up in March establishes a small routine with substantial effects. Combined with bee-friendly perennials and flowering shrubs, it increases biodiversity and makes the use of poisons increasingly unnecessary.

One further benefit is often underestimated: children can watch tits at feeders or nest boxes from close range. This helps them understand why the Asian hornet is regarded as a problem and how ecosystems work. The garden becomes more than simply a “back garden”; it turns into a small learning space - and, at the same time, a safer place for bees.