HPH156 : Creating a garden that’s biodiverse – with Lisa Kerslake from CIEEM
Lisa Kerslake from CIEEM explains how self-builders can encourage wildlife to flourish on their plots.
Interview with Lisa Kerslake
Lisa Kerslake is an ecological consultant who gives advice to people putting in planning applications, because a lot of wildlife in the UK is protected. Lisa's previous jobs have included environmental work in the voluntary and public sectors.
Growing crops has had a big impact in the UK
Human activity has long affected wildlife. For example, we’ve removed trees and quarried caves where bats originally lived, so they’ve followed the stone and the wood into our houses. The last hundred years has seen massive change. Whilst not devoid of wildlife, huge areas of intensive agriculture in some parts of the country support much lower levels than before.
The wider implications aren’t yet known
Lisa cites a local decline of a formerly common species; water voles were once widespread across the UK but now in Worcestershire there are perhaps two or three known sites.
For every decline we can measure, there are those we don't really know about. Considered common, hedgehogs don't have any protection. Lisa thinks a population decline is actually the reason fewer are seen squashed on the road; unfortunately it's difficult to measure because they’re hard animals to survey.
Find out if your plot has ecological value
Ecology, the study of living things, looks at the relationship between plants, animals and the wider environment e.g. soils and water.
Whether your plot is Brownfield or has vegetation, you need to know if there is any value for nature conservation or wildlife. It may be hard to tell what's there without looking in more detail, as all sorts of things that live in the local environment might actually use the plot: plants, invertebrates and common mammals.
Assess things before construction begins
Ecological studies look at plants and animals that are evident, but also if the plot would suit species not evident at that time, e.g. plants not flowering and animals hibernating. At different times of the year the plot might support animals that are rare or protected.
National planning policy encourages biodiversity
Your ecological survey may discover evidence of or potential for protected species. Submitting a biodiversity method statement alongside your planning application will show how you plan to conserve them and enhance their environment, e.g. by planting nectar-rich plants.
The right materials will protect wildlife from construction and vice versa. For example, rather than traditional roofing felt, modern roofs are typically lined with breathable membranes that are lethal for bats. Moreover, bats will destroy the properties that make the membrane breathable. It’s advisable to integrate bird and bat boxes into the fabric of a new build as you don't need to maintain them.
Urban areas are actually very rich in wildlife
Surprisingly, some areas of countryside don’t have an intrinsically high wildlife value. Towns and cities have bats, foxes, hedgehogs and even badgers. Interesting plants grow on disturbed ground where you'll find associated invertebrates.
A less manicured garden creates a good habitat
Fake grass and plants might save on maintenance, but are probably not environmentally friendly and they don't support any wildlife. Lisa says it’s better to reduce mowing, let grass grow longer and put in planting that needs less management, like a wildflower bank. This is a cost-effective way of creating a very good habitat.
Diverse habitats are more beneficial for wildlife
Lisa explains how practical measures improved the biodiversity of a self-build development site in North Warwickshire. It was overgrown with nettles and scrub, some mature trees and a pond. Lisa’s surveys discovered reptiles and amphibians. She recommended incorporating features that would help the animals already there and benefit other species that might come in:
|Long grass and scrub maintained around edge of the plot, not totally incorporated into gardens||Ensured the habitat was suitable for reptiles|
|Rubble piles were used||Beneficial for both amphibians and reptiles|
|Managing the pond so that it retained its size and didn't overgrow||Open water and shallow areas continue to be used by wildlife|
|Appropriate management of the trees, e.g. removing diseased limbs only||The remainder of the trees were retained, valuable for wildlife|
Small actions can make a big difference
If enough people make small changes to their gardens, the difference can be exponential. Lifting one panel at the bottom of your garden fence will let hedgehogs move between gardens. Adding a pond can encourage toad and frogspawn, and provide somewhere to drink and bathe for birds and other animals.
Start small and plan a variety of structure and flowering plants, as it all feeds up the chain: invertebrates feed on plants, birds feed on invertebrates and so on.
We can use our plots to encourage nature
While it’s tempting to create something new, it may be easier and cheaper to work with what you've got. But if you're starting with a blank canvas, here are ten tips to create a wildlife-friendly garden:
- Work with the environment you have, e.g. some plants only grow in alkaline soils.
- Plants that grow, blossom and fruit over the whole season feed invertebrates, birds and other animals all the way up the food chain.
- Use as many native species as possible. For hedges, these include: hawthorn, blackthorn, hazel, field maple and holly.
- Birds feed on berry-producing plants like pyracantha.
- If you need a fence, trail a climbing plant such as common ivy over it. This helps birds in the late winter when it has berries.
- Non-native plants such as buddleia can still attract butterflies etc.
- Avoid laurel and conifers that provide a good screen but are quite devoid of wildlife.
- Consider leaving areas wild; rough grass and scrub benefit wildlife.
- Compost heaps support colonies of worms, grass snakes will lay their eggs in them, and dormice may even hibernate in them.
- Bird and bat boxes attract wildlife into your garden, are relatively cheap and easy install.
There are plenty of resources available online
A Google search will find information on creating a wildlife garden.
- The Royal Horticultural Society is good for explaining the qualities of typical garden plants
- Wildlife trusts may offer advice on improving your garden and local environment
- The RSPB campaigns about giving nature a home
If you need to employ a consultant, the Chartered Institute of Ecology and Environmental Management has a professional directory with details of experts in your area.
Find out more
Visit the websites of CIEEM and Swift Ecology
Download a transcript of the interview with Lisa Kerslake
Please connect with me
- Subscribe, rate and review the podcast in iTunes
- Rate and review the podcast on Stitcher
- Like our Facebook page
- Follow us on Twitter
About The Author
Robin Goldberg is a teacher, currently enjoying a sabbatical during which he is overseeing building work to his house and getting ‘hands on’ where possible. The works include a loft extension, but the sabbatical is also being spent planning for his longer term goal of a self build.