With humans – and our polluting, road-killing, noisy machines – largely out of the way, nature is having a big party. This is one of the few positives of lockdown to which we can cling, witness and even encourage. “The land taken up by gardens in the UK is greater than the area of all our national nature reserves,” says Mark Fellowes, a professor of ecology at the University of Reading who specialises in interactions between humans and wildlife, as well as urban ecology. Everyone with outside space, he says, “can become a nature reserve manager. You can do really simple things to affect biodiversity where you live.”

These days, even the most lackadaisical gardeners are taking a greater interest in whatever outside space they have, not least because panic food-buying seems to have segued into panic food-planting. Grow bags have become hard to come by and the Royal Horticultural Society (RHS) has reported increased inquiries about growing fruit and vegetables.

But whether or not people are growing new things, terraces, balconies and gardens are receiving unprecedented levels of attention this spring. If we employ a few biodiversity-boosting tricks, we can keep the nature party in our backyards going for good.

Feed the birds, not the squirrels  Trust for Ornithology says that Britons spend between £200m and £300m a year on bird-feeding products. “Half of households at some point feed birds in their garden,” says Fellowes. It’s one of the key ways we can commune with nature, and during cold winters it can help birds survive.” But during the breeding season, roughly March to June, putting food out can attract nest predators, too. “Squirrels and magpies are the two most common,” says Fellowes. In one of his studies, more than 44% of feeders were visited by squirrels

As such, investing in a pest-proof feeder is important. Fellowes recommends those that close if a squirrel, or anything heavier than a small bird, lands on them. This does not mean bird tables should be banned, but Fellowes recommends “putting small volumes out regularly, clearing it up and putting out food the squirrels don’t like”. Goldfinches love niger seed, for example, which squirrels eschew.

Keep feeders clean

“Disease can spread through feeders every now and again,” says Fellowes. “Our greenfinch population was badly affected by trichomonosis that was probably spread via bird feeders. It’s not definite, but all the circumstantial evidence points in that direction.”

Install nest boxes and bricks

When people get nest boxes, says Fellowes, “they get very keen and they can put cameras in the boxes. It’s fantastic: nature on your doorstep that you can really connect with.”

Resist insecticides Allowing the natural insect population to grow will attract ladybirds, which will then eat aphids. chicks.

Unless you are competing in the Chelsea flower show, he says, “your garden can deal with a few aphids. And if you allow natural insect populations to grow, you will attract ladybirds, which eat aphids and have crashed in numbers.”Birds can’t feed their chicks the seed you put out. Chicks need bugs, so it is not a good idea to kill them. “Urban birds tend to have fewer offspring than ones in the countryside,” says Fellowes. “That’s probably to do with the amount of insects that are available to feed on in the breeding season.”

Plant for invertebrates

Plant caterpillar food, too

You can’t have butterflies and moths without caterpillars. “As we have simplified and tidied our gardens, we have provided fewer plants that the caterpillars can do well on,” says Fellowes. “Some of the most beautiful species feed on nettles and brambles, and most people won’t want those in their gardens. At this time of year, holly blues are laying their eggs on holly.” They feed on ivy, too. So let a little corner of your space stay wild.

Dig a pond

aakant a tapestry lawn

Lionel Smith, a colleague (and former PhD student) of Fellowes, has spent years developing a nature-lover’s alternative to a lawn. “Lawns are really not very ecologically friendly,” says Fellowes. “Not much lives in them and, if you fertilise, mow and water them, they’re a net CO2 contributor, rather than a typical plant that helps absorb CO2.”

Covering up the spaces between neatly arranged ornamental plants with bark chippings is not great for biodiversity, says Fellowes. If you want to control what plants grow in 

your beds, it is healthier to grow your chosen plants more densely together – another reason the cottage garden explodes with nature. Perhaps you won’t balk when a dandelion pops up when you know that pollinating insects love them.

“I would never suggest anybody must follow my unkempt way of gardening,” says Fellowes. “But if you’re a neat freak, think about how you can get your aesthetics while using species that will also benefit wildlife. Anything positive you do will have an effect. You don’t have to let your garden turn into a jungle.”

Don’t poison slugs

“I absolutely wouldn’t use pellets or the powders that you can put out to kill slugs, simply because hedgehogs can eat them and be poisoned,” says Fellowes. The old beer-trap method is a more responsible way to kill slugs. There are endangered species of slugs, says Fellowes, “but you won’t be getting those in your garden”.

Slugs are excellent food for hedgehogs, amphibians, beetles and birds, so you may consider them worth having in that respect. There are humane traps, too, so you could relocate your slimy garden chompers to somewhere they will be more welcome.

Get your cat a bell

Fellowes is always doing research on cats. A few years back, Fellowes’ team calculated that domestic cats in the UK were killing about 185m prey items a year. “About a million birds a week,” he says. The International Union for the Conservation of Nature says that domestic cats rank third globally among alien species threatening vertebrates.

It is hard to know whether they are currently contributing to species decline in the UK; they may have done their worst long ago. Either way, they are certainly killing a lot of animals and not even eating them. (If you think your cat is an exception, be aware that studies have found that cats bring home only about 20% to 30% of their prey.)

Keeping cats indoors as much as possible is recommended, especially at peak hunting times (dawn and dusk) and if you live near a nature reserve. Also, putting warning bells on collars, says Fellowes, “certainly reduces predation rates”.

Leave piles of pruning

Dump them on a compost heap, or just leave them in piles to rot down, and make a home for small mammals, amphibians and invertebrates such as centipedes – 

“just like in natural woodland”, says Fellowes. They could take months to break down, so you have to think carefully about where to leave them.

Similarly, leaving a little pile of chopped wood will attract stag beetles and solitary bees. Alternatively, you can buy homes for the bees from garden centres. “They’re at their peak at this time of year,” says Fellowes. The homes “attract leaf-cutter bees, which are really cool to watch”. Slow worms love compost heaps, too, and one of Fellowes’ few sightings of a grass snake was in his own suburban compost heap.

The thing to avoid in all of this, says Fellowes, is becoming judgmental. Decking, for instance, may not be the best thing for nature, but if you need it for practical reasons you can still invite nature in with bird boxes and thoughtful planting. “These are things that we can all do,” he says.