Rats in the Garden

Gardens can provide a safe harbour for rats and other rodents. Making rats a common problem in many UK gardens, drawn in by the availability of food, water and shelter. These adaptable rodents often nest under sheds, garages, out buildings, compost heaps, or dense undergrowth, making them difficult to spot initially. The rat species you are most likely to find in your garden is the brown or Norway rat (Rattus norvegicus). The black rat is more likely to be found near coastal areas and ports.

However, if you notice burrows in the soil, gnaw marks on wood, or droppings, these are the tell-tale signs of their presence. Rats are destructive to garden plants, flowers, shrubs and structures and can also pose health risks to people and pets as they carry diseases and parasites. Since they breed rapidly, even a small infestation can quickly grow out of control if left unmanaged. Therefore, it is important to address the issue early and take measures to deter, monitor, and control their activity to keep your garden safe and healthy.

There are several mouse and vole species native throughout the UK, and a small number of these can take advantage of food and lodging opportunities provided in gardens. However, their numbers are rarely high enough to cause much damage. These rural species normally inhabit specific areas and habitats:

• Wood mouse (Apodemus sylvaticus) favours woodland and hedgerows, though it can sometimes venture into homes.
• Bank vole (Myodes glareolus) prefers earth banks and wooded areas.
• Field vole (Microtus agrestis) is often found in rough grassland.
• Yellow-necked field mouse (Apodemus flavicollis) is most associated with broadleaved woodland, hedgerows, and rural gardens.
• Common vole (Microtus arvalis) is mainly spotted in meadows, heathland, and agricultural fields.

Since these animals are opportunistic, gardens that provide shelter, easy access to food (like seeds or produce), and minimal disturbance attract them. Although they do not usually reach pest-level populations, their presence can still result in the occasional gnawed plant, tunnelled lawn, or scattered fruit. Therefore, it's a good idea to monitor signs of activity and maintain good garden hygiene to keep mouse and vole visits under control.

Start by looking for potential nesting areas - under rubbish, timber or wood piles, in drainpipes, and underneath or inside sheds, outhouses, or garages. These locations provide warmth, shelter, and often a nearby food source. Rodents have a characteristic, musky smell when present in large numbers, and you may also hear their scurrying or squeaking, especially in quiet moments. They are usually nocturnal feeders, so you will not normally see them during the daytime.

Brown rats are the most common species you'll encounter in UK gardens, and they are extremely adaptable. These rodents seek places that offer easy access to food, water, and shelter. This is why gardens with accessible fruit, vegetables, bird feeders, or compost heaps often attract them.

Rats create clear, well-trodden runs along walls, fences, and through undergrowth, typically using the same paths every night to reach their food sources. In addition to burrows - often found in quiet, sheltered locations like beneath sheds, compost bins, or dense vegetation - rats leave clear signs of their presence, such as cylindrical droppings, gnaw marks, and smear marks along surfaces they travel.

Their ability to climb allows them to exploit structures, overhanging brances, and garden features to reach nests or food. Their constant need to gnaw keeps their growing teeth in check but damages sheds, garages and often their contents. What you should lok for:

• Holes or burrows: burrows are about 6-9 cm in diameter and can be located anywhere that is relatively undisturbed and near to food.
• Runs and tracks: runs are typically 5-10 cm wide near cover along walls, banks and hedges and through vegetation. Rats memorise pathways and use the same routes to and from their shelter. Smear marks may be visible where they run along stone, wood or metal, such as on steps, fencing and gate posts. They tend to travel along the ground, but they can climb and jump to get to food and shelter.
• Droppings: these are approximately 15-20 mm long, cylindrical, flat at one end and often pointed at the other. They are moist when fresh, but dry within hours.
• Damage: rats will gnaw at food, packaging and barriers in their way, making holes or enlarging existing ones. They also gnaw objects when investigating them. Their teeth are hard enough to get through many hard materials such as wood, rubber, vinyl and low grade concrete and cement. Outdoors this can be fencing panels, sheds where food is stored, compost bins and electrical wiring in sheds, such as on power tools.

However, spotting rats during the day usually means they are short of food and are desperately searching for new sources. Additionally, droppings, gnawed materials, or smudge marks along walls and entry points can help identify active rodent pathways or nests. Regular inspections in these problem areas help early detection, making it easier to act quickly and prevent large infestations.

Mice and voles are smaller garden rodents that can be surprisingly active and resourceful, especially in areas with dense vegetation or plenty ground cover. They construct intricate tunnel systems for shelter, which may have several chambers and multiple entry and exit points, providing them safety from predators and harsh weather.

Voles create a network of shallow tunnels that can leave lawns feeling soft underfoot or looking uneven, as their burrowing disturbs the soil. You may notice subtle signs of their activity, such as small gnaw marks on fruits like strawberries or apples and even scattered berries left beneath plants.

Mice commonly gather soft materials, such as torn paper from garden sheds, to build their nests. Both mice and voles are nocturnal, so catching sight of them during the day is rare but look for their distinctive tracks and droppings.

While they seldom pose the same level of threat as rats, their feeding habits can still resilt in noticeable damage to seeds, bulbs, and young plants, particularly during plating season. Understanding these habits helps you identify which rodent is causing issues in your garden and informs the best plan for effective control.

• Voles can make a system of shallow tunnels that give a soft and uneven surface to lawns and soils.
• Small gnaw marks can be seen on fruits such as growing strawberries and stored apples and seeds. Small fruit, such as berries may be left scattered on the ground under the plants.
• Torn paper in garden sheds shows mice are gathering nesting material.

Rodents can cause an array of damage in your garden which can range anywhere from feasting on fruits and vegetables to gnawing on shed doors and wires. The type of damage that may be caused will vary depending on the species of rodent involved.

Rats are highly adaptable and resourceful rodents that can inflict extensive damage on a garden and its surrounding buildings.

• Eat a wide range of garden vegetables, including various root vegetables, such as carrot, parsnip, beetroot and potato tubers. They will eat the crops while they are growing and any they find stored in garages or sheds. They also eat fruits in storage such as apples, and seeds.
• Eat feed put out for wild birds, poultry and pets, so this needs to be on bird tables or in hanging feeders, not on the ground and cleared away daily at dusk, along with any spillage's.
• Damage containers and packaging materials in which foods, animal feed and seeds are stored.
• Cause structural damage to buildings by burrowing and gnawing, undermining building foundations, paving in patios and paths, causing settling, and damage earth banks.
• Gnaw on electrical wires or water pipes, above or below ground.
• Rats are opportunistic, so once they are in your garden they will seek new places to live, feed and breed, such as in your house, so it is important to control them as soon as possible. You may only see one or two, but there will be many more that you don’t see! They can damage buildings further by gnawing openings through doors, window sills, walls, ceilings, and floors to gain access.

Mice and voles will feed on a wide range of plants, but do relatively little other damage in the garden:

• Eat recently sown vegetable seeds such as peas, beans and sweet corn and the foliage of seedlings.
• Eat bulbs and corms, especially recently sown ones. Tell-tale signs are holes in the soil where they have dug down to feed on them.
• Eat fruits such as strawberries, even before they are ripe and berries.
• Eat stored fruit such as apples.
• Voles can eat the bark of woody plants, especially in winter.
• Voles make a network of shallow tunnels which can give lawns an uneven surface.

Rats, mice and voles can carry a wide range of rodent-borne diseases caused by bacteria, viruses and helminths (worms), including Salmonella, Leptospirosis, Weil’s disease, Cryptosporidium and rat bite fever. They can infect both people and pets. They can also carry ectoparasites such as ticks, mites, fleas and lice that carry another set of diseases, and can pass them on to others.

In the garden, contamination from rodents may not be as obvious as in the home, but there are several means of disease transmission, which include:

• Direct contact with excreta (urine, faeces, saliva) or inhalation of dust particles.
• Handling or inhaling dust particles containing infectious microorganisms aerosolized when disturbing compost heaps, woodpiles, or other material contaminated with dried rodent urine.
• Handling of infected rodents, (alive or dead) or scratches or bites from rodents.
• Pets catching/eating rodents gives parasites the opportunity to cross infect pets and people.

Rodents need food and shelter to live, so if you can take steps to deny them both of these you can reduce the chance of them invading your garden.

• Eliminate any harbourage points around buildings and sheds. Seal any small gaps that allow them access. Rats need only a gap height of around 15mm to gain entry and mice 6mm, though normally mice access holes are 20-20mm in diameter.
• Remove potential nesting sites by keeping gardens clean and tidy. Remove piles of wood, garden clippings etc, cut back overgrown areas, and keep lawns short.
• Cover any household food waste such as in compost heaps and dustbins. Make sure bin lids are tightly fitted and rubbish bags containing food are not left outside for long periods.
• Do not scatter bird feed on the ground: use a bird table or feeder basket to feed birds and clear away before dusk.

Wood mice, yellow-necked field mice and voles rarely build up in large enough populations in gardens to become serious pests, so it is usually not necessary to control them.

There are however, a number of DIY rodent control products available for the home use to help eliminate rats and mice.These will need a degree of skill and care to use effectively and safely. You should only use products that are designed for the ‘target’ pest animal and use methods that are considered safe for other people, pets, wild animals and the environment. You should read the description and instructions on DIY product packaging very carefully before use.

If you are concerned that rats are nesting in your garden or that rodents have entered your property, contact a professional pest controller such as Rentokil. Our technicians are highly trained and professionally qualified, with credentials recognised by the pest control industry, BPCA and NPTA. They are trained, qualified and possess the knowledge and expertise to assess your rodent problem and deal with your infestation effectively. They can identify potential entry points, recommend effective proofing measures, and implement solutions safe for families, pets, and wildlife. Contacting an expert offers peace of mind and ensures that rodent problems are managed swiftly, thoroughly, and in compliance with safety standards.

Use biocides safely. Always read the label and product information before use.

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  What should I do if i se a rat in my garden?

  If you spot a rat, don't panic, but do take action to make your garden less "rat friendly." Remove standing water, tidy up woodpiles, and secure your compost bins. Avoid leaving pet food outside and stop feeding birds temporarily. Observe where they are coming from to identify burrows that may need sealing or trapping.

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  Should I be worried if I see a mouse in my garden?

  Generally, seeing a single mouse outdoors is not a cause for immediate alarm, as they are part of the local ecosystem. However, you should ensure your home is sealed to prevent them from moving indoors. Monitor for signs of a large population, such as significant damage to plants or burrowing near foundations, which may require intervention.

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  How do i get rid of rats under a shed?

  To get rid of rats under a shed, eliminate food sources like fallen birdseed or pet bowls. Bury heavy-gauge wire mesh 12 inches deep to secure the perimeter and help block tunnelling. Seal structural gaps with steel wool or mortar, If activity continues, use enclosed snap traps or consult a professional to ensure safety for pets and local wildlife.