Heatwave 2020: 12 ways to protect and enjoy your garden

Find out how to protect a garden from a heatwave this summer with these practical tips

Heatwave: garden sail
how to prepare your garden for a heatwave
(Image credit: Leigh Clapp Photography)

Wondering how to prepare for and protect your garden for a heatwave this summer? This summer is being touted as possibly as hot as last, and at the moment it looks like it might be hotter. And, if that happens, it will wreak havoc in our gardens – and make them uncomfortable to sit in. So, best to over prepare than under prepare with these tips for keeping your plants healthy during extreme weather.

Find more garden ideas, visit our dedicated page.

1. Pick the best time to water plants in hot weather

plants in a garden

(Image credit: Leigh Clapp Photography)

The best time to water your plants in hot weather – and especially during a heatwave – is early morning or evening, when all risk of burning tender growth is gone. Watering during lunchtime is a big no-no, as water droplets will act as tiny magnifying glasses, making the heat damage much worse. The best time to water potted plants in hot weather is the same, but you'll need to make sure you water your container garden both in the morning and evening, as the soil dries out much quicker in containers. Read our guide to container gardening for more tips.

If you have the budget, consider installing a water irrigation system, which is a water-efficient way to ensure your plants get watered, even when you're away on holiday.

2. Tips on watering plants in extreme heat


(Image credit: Hose)

It may seem logical to flood your plants with as much water as possible, but this will actually do more harm than good during extreme weather. By over-watering, you are adding to the stress the plant is already under in needing to acclimatise to higher temperatures. Plants that have access to good soil are able to adjust to hot weather, provided the soil at root level doesn't dry out completely. 

So, every morning during the heatwave, perform this test: stick your index finger into the soil around the root; if the soil is still wet below the surface, there's no need to water. If it's just damp, it's time to water again. 

If you don't think you'll have much time to water plants regularly during a heatwave, consider choosing from our list of best drought tolerant plants

3. Protect plants from direct sun

container garden

(Image credit: Leigh Clapp Photography)

Lunchtime is by far the most dangerous time of day for plants during very hot weather. There are several things you can do to prepare your garden for a heatwave and alleviate the pressure on your plants:

  • Mulch: mulching is one of the most effective ways to prevent moisture loss from around the root area. Make sure the mulch layer is at least a couple of inches deep;
  • Use a shade cloth: if you're worried about young plants or soft fruit, putting up a shade cloth might be a temporary solution. You will need a structure to mount it onto, such as a frame or pergola; 
  • Row covers: if you're planning a kitchen garden, these are very useful for protecting tender growth and the soil. You'll need hoop supports and shade netting to build your row covers.

4. Use a watering can 

Watering can - use it to protect plants during a heatwave

(Image credit: Getty Images)

Even if there isn't a hosepipe ban, it's a good idea to stop watering your plants with a hose during very hot weather, as the spray from the hose will inevitably get on to leaves, potentially worsening the effects of the sun. A watering can allows you to water the root area only. It's more work, but worth it to protect your garden. Use our watering tips for more plantcare tips.

5. Vermiculite: the must-add for container plants

Small garden with container planting

(Image credit: Maayke de Ridder)

Those with container gardens will know how difficult it can be to keep the soil moist, particularly in terracotta pots. One way to prepare your garden for a heatwave is to add vermiculite to your soil mix. It is a great way to increase water retention in the soil, preventing the water from evaporating too quickly. Vermiculite also improves the absorption of nutrients and fertilisers, making your container plants healthier and therefore more resilient during a heatwave.

6. Drought-resistant plants: what to plant

pink, lilac and mauve flowers in a garden

One way to prepare a garden for a heatwave is to choose the right plants in the first place. Some garden plants need less watering than others; choosing to plant these, whether in borders or in containers, will help you save water and ensure they thrive, even in extreme hot weather. 

Drought-resistant plants include lavender, rosemary, sage, vervain and artemisia. Don't miss our pick of the best low maintenance garden plants before you head to the garden centre this weekend.

7. Order a water butt now

wildlife garden butterfly on flower

(Image credit: Leigh Clapp)

While the weather is still up and down, get a water butt installed in your garden. That way, hosepipe ban or not, you'll have water on tap in the garden whenever you need it. Find the best water butts: these can be quickly delivered to catch those rain showers.

8. Planting in hot weather

Spade in an organic vegetable patch

(Image credit: Leigh Clapp)

Planting at the right time of day in hot weather can ensure your plants' survival. If you're planting in full sun, plant in the evening, and water well. Ideally, plant on a cloudy day and water well if the weather's still warm. Then mulch with a 50/50 organic mix and organic compost. 

9. Pergola designs for shade: install one to protect plants

festoon lighting over a vine covered decking dining areas

(Image credit: Lights4Fun)

Pergolas can work really well to reduce heat in your garden and to protect plants from direct sun. More substantial than garden arches, but giving you more freedom with positioning than a patio roof, pergolas can help you protect your plants (and yourself, in fact) from getting scorched. While a pergola will typically have a latticed roof that does let some sun in, you can get designs specifically for creating more shade, with retractable and replaceable canopies. 

Alternatively, train a bougainvillea up your pergola roof: these lovely Mediterranean climbing shrubs are drought-tolerant and love the sun, and can work as a living roof to protect your other plants. Find out how to build a pergola yourself in our step by step guide.

10. Add a sail shade

garden sail

(Image credit: Argos)

Need a speedier shade solution than a pergola? A sail shade is perfect. You can attach it to fences, the house, even trees – or erect posts to hold it in place. Need shade in more than one spot? Get two... Or just group plants that are suffering under the one you have.

Find all the sail shades and fixings you need in one place on Amazon.

11. Bird baths: help wildlife during a heatwave

It's not just plants that'll be suffering during a heatwave, but also animals and insects that visit your garden. Heatwaves put massive pressure on all wildlife, but you can help, while making your garden look even more beautiful. Our top tips for helping wildlife during a heatwave are:

  • Install a bird bath: these come in a variety of beautiful shapes and designs; make sure the water is always fresh. 
  • If you want to help bees as well, get a shallow bird bath and place some pebbles inside it – these will act as rafts and prevent the bees from drowning. Find out more about creating a bee-friendly garden in our guide.
  • Leave bowls of fresh water on the ground for hedgehogs; you can also leave food out for them, such as diced carrot. 
  • Don't get rid of ivy and other climbers: these provide invaluable shelter for birds, insects, and hedgehogs. 
  • Find out more about creating a wildlife-friendly garden in our guide.

Beachcomber bird bath by Waitrose

Beachcomber bird bath, Waitrose Garden

(Image credit: Waitrose Garden)

12. Buy the best bbq

Lotus Grill Smokeless BBQ from Cuckooland

(Image credit: Cuckooland)

During a heatwave, what are you going to do? Get out and enjoy your garden as much as possible, that's what – and if yummy grilled food is involved, even better. For those who tend to neglect their gardens, using it more for parties and BBQs may well provide the incentive to give your plants a bit more love. 

To make the absolute most of summer in your garden, choose from our best barbecues

More gardening advice:

Anna Cottrell
Anna Cottrell

Anna is Consumer Editor across Future's home brands. She moved to the world of interiors from academic research in the field of English Literature and photography. She is the author of London Writing of the 1930s and has a passion for contemporary home decor and gardening.