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last updated Dec 23, 2013
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Grey squirrel. Image: ©www.gardenworldimages.com

The grey squirrel is a common garden mammal that both delights by its acrobatic movements and annoys by feeding on flower buds, bulbs, fruits and vegetables.

What are grey squirrels? Back to top

Grey squirrels often enter gardens from adjacent woodlands or other areas with trees and shrubs.

They attack a wide range of ornamental plants, fruits and vegetables. Particularly at risk are tulip bulbs, crocus corms, sweetcorn, strawberries, apples, pears, nuts, sunflower seed heads and flower buds of camellias and magnolias. Trees, including sycamore, maples, ash and beech, can be badly damaged by bark stripping.

Symptoms Back to top

You will usually spot the squirrels in your garden. This is some of the damage they cause:

  • Eat fruits, nuts, seeds, flower buds, vegetables and bark
  • Dig up and eat bulbs and corms
  • Raid bird feeders and take eggs from birds’ nests
  • Damage lawns by burying or digging up winter food stores
  • Strip bark off trees, especially sycamore, maples, ash and beech
  • Gnaw on plastic, such as hosepipes and plastic netting
Grey squirrel damage on hazel buds. Image: RHS, Horticultural Science

Grey squirrels eat a wide range of plants and plant parts, including flower buds, like these from Corylus avellana (hazel).

Control Back to top

Non-chemical control

It is not possible to stop squirrels from coming into a garden. Placing netting over plants that are being damaged may be of little help, unless wire netting is used as plastic netting is easily bitten through.

Animal repellent substances and scaring devices are likely to give no more than short-term protection.

It is permissible to control grey squirrels by shooting or trapping, provided this is done in a humane manner, but shooting may not be feasible in gardens for safety reasons.

Traps are available from some garden centres or mail order companies. The most widely used is a cage-type trap that will capture squirrels alive. Such traps can be baited with peanuts and must be checked at least once every 24 hours, preferably morning and evening. Under the Wildlife and Countryside Act it is illegal to release non-indigenous animals into the wild, so any grey squirrels caught should be killed. This can be done by shooting or allowing the squirrel to escape into a sack, where it can be held while a sharp blow is delivered to its head. Drowning squirrels by putting the trap in a water butt is not a humane method of dispatching squirrels.

Unfortunately, more squirrels are likely to move in to occupy the vacated territory, so a garden is unlikely to be squirrel-free for long.

Chemical control

There are no poisons approved for use against grey squirrels in gardens.

Biology Back to top

The grey squirrel originates from North America and was introduced into Britain during the 19th century. It is now found throughout most of Britain and has largely replaced the native red squirrel (Sciurus vulgaris).

Grey squirrels can produce two litters a year, which are raised in nest-like structures called dreys. Young are generally produced in February and July; a typical litter size is three or four. Grey squirrels are active throughout the year on all but the coldest days.

Bark stripping appears to be associated with stress brought on by territorial disputes with other squirrels. It is more likely to happen when squirrel numbers are high and there is increased competition for territories.

 

Image: © GWI/Dave Bevan. Available in high resolution at www.gardenworldimages.com

Quick facts

Common name Grey squirrel
Scientific name Sciurus carolinensis
Plants affected Many ornamental plants, fruits and vegetables
Main symptoms Strips bark from trees, eats flower buds, bulbs, corms, seeds, ripening fruits and vegetables
Most active Year round
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