Asian hornet: how tits can help protect your garden bees

More and more gardens are being unsettled by an invasive predator: the Asian hornet. It hunts honey bees and other pollinators, potentially disrupting fruit crops for home gardeners as well. One small, familiar bird cannot solve the problem, but it can substantially reduce its impact: the tit. Anyone who considers tits as early as March can noticeably shift the balance of power in the garden.

Why the Asian hornet puts our gardens under pressure

The Asian hornet is regarded as 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 large numbers.

A crucial process takes place out of sight in late winter and spring. Overwintering queens emerge, look for a suitable location and establish new nests. Unless they are disrupted at this stage, their colonies can consume enormous quantities of insects over the course of the year – up to several kilograms per colony.

“Anyone who waits to act until the large nests become visible in summer has already missed the crucial phase.”

Experts consider complete eradication unlikely to be realistic. These insects reproduce rapidly, while Europe has few natural predators, such as the European bee-eater or certain birds of prey. However, these occur mostly only in particular regions or seasons. In practical terms, they play no role in the home garden.

This is where another contributor comes into play, one that is far more common in built-up areas: 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 their busiest period: they make trips every few minutes, filling their chicks’ beaks with every caterpillar or larva they can reach. Over just a few weeks, this adds up to several thousand prey items.

If a hornet nest is within reach, its larvae can also become part of the menu. To a tit, it makes little difference whether it finds a butterfly caterpillar or a hornet larva – the key factor is that it is rich in protein.

• Each day, parent tits bring insects to their young hundreds of times.
• Across a full 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 nest sites or former nests. They feed there on dead insects and larval remains, especially during late autumn and winter. This further weakens the hornets’ breeding success, as fewer new queens mature.

“Tits are not a miracle cure for the Asian hornet, but they create lasting 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. The response depends on many small measures. Tits are one of those elements – and among the most practical ones for the home garden.

How to attract tits to your garden in good time

For a bird to support your bees, it needs one thing above all: somewhere to nest. Natural tree holes have become scarce in built-up areas, and March is the decisive month, when the competition for nesting sites begins.

The right nest box: dimensions, height and position

A simple wooden nest box is entirely sufficient, provided a few details are right:

• Entrance hole: approximately 2.5 to 3 centimetres in diameter – large enough for tits but too small for larger intruders.
• Height: 2 to 5 metres above ground level, depending on the tree or house wall.
• Direction: away from the prevailing wind, preferably facing east or south-east.
• Safety: keep it away from routes cats can use to climb, and avoid intense direct sunshine in high summer.

Timing matters. Hanging the box before mid-March gives you a much better chance of a pair of tits taking it. If you wait until April, you will usually be too late, as territories have generally already been claimed.

Food in late winter, insect abundance in spring

Tits also need an additional food supply if they are to thrive in your garden. This simple rule of thumb can guide your planning:

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

Providing nothing but seed all year round makes the birds complacent. They will then search less intensively for insects – including hornet larvae. The aim is a garden where birds catch the main share of their food themselves.

Plants, water and no chemicals: making a garden tit-friendly

A lively, slightly “untidy” garden provides considerably more food than a sterile gravel garden. Helpful features include:

• Hedges and shrubs: such as elder, hawthorn and hazel, which offer insects, berries and shelter.
• Wild corners: piles of leaves, stacks of twigs and unmown areas support countless small creatures.
• A water source: a shallow dish or small pond, cleaned and topped up regularly.
• No pesticides: toxins affect insects first, followed by insect-eaters such as tits.

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

Tits are legally protected species. 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 breeding attempts to be abandoned.

What tits can do – and what they cannot

Supporting tits helps create a kind of safety net for your garden. They consume hornet larvae, pick caterpillars from fruit trees and eat aphids from shoots. This reduces the number of pest insects and eases the pressure on pollinators.

Even so, this does not replace professional handling of hornet nests. A strong colony can pose a danger to people, particularly those with allergies. If you discover a nest, you should therefore:

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

Tits can curb the spread of the hornet at several points, above all by eating larvae and thereby reducing the potential number of new queens. If this happens in many places at once, 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 apiary to give insects and birds cover,
• a small pond or drinking station with shallow ways out.

Bee keepers who previously had no tits nearby often report more bird activity after only one to two years – as well as, subjectively, less hornet pressure directly around their hives. This is no substitute for monitoring, but it can form part of a wider package of measures.

The effort is equally worthwhile for purely ornamental gardens. Anyone who adds a reminder to clean the nest box by February at the latest and put it up in March establishes a small routine with a substantial effect. Combined with bee-friendly perennials and flowering shrubs, this increases biodiversity and makes the use of poisons progressively unnecessary.

One further aspect is often underestimated: children can observe tits close up at feeders or nest boxes. This builds an understanding of why the hornet is considered a problem and how ecosystems work. The garden becomes more than simply a “back garden”; it turns into a small learning space – and, incidentally, a safer place for bees.