How to Adapt Your Gardening Practices During a Heatwave

How to Adapt Your Gardening Practices During a Heatwave

As heatwaves become more frequent this summer, both plants and wildlife in the garden are feeling the strain. This article highlights the causes and effects of extreme heat, along with practical tips for maintaining a resilient garden.

✍️ Marie Ponçot and Milena Bauchet • 📸 Marie Ponçot

Table of Contents

🌡️ What Happens in the Garden During a Heatwave?

🔥 The Effects of Heatwaves on Plants 🤲 Protecting Your Vegetable Garden 🌳 Preparing for Future Heatwaves 💧 Watering During a Heatwave 🦔 Beneficial Creatures in the Garden: An Indispensable Aid!

🌡️ What Happens in the Garden During a Heatwave?

A heatwave is characterized by persistently high temperatures that do not drop at night, leading to dry air, depleted moisture in the soil, and stressed plants. This increasingly common phenomenon each summer can have dire consequences on garden biodiversity—many thirsty species suffer, and some may perish suddenly due to extreme heat and prolonged dry spells.

When plants experience water stress—where demand for moisture surpasses available resources—they may "burn out," halt growth, and yield lower harvests. While some more resilient species can adapt, others can decline rapidly under these conditions.

Here, the amateur gardener plays a crucial role by adopting effective practices to mitigate the impact of heatwaves on both the garden and its biodiversity!

🔥 The Effects of Heatwaves on Plants

One of the most concerning effects of a heatwave for gardeners is the increase in diseases and pests, fueled by the combination of heat and a lack of natural predators (birds, hedgehogs, insects, etc.). These beneficial creatures often seek refuge in shaded areas or near water sources, avoiding overly sunlit sections of the garden.

Additionally, plants may exhibit gradual decline, which can manifest as yellowing, drying out, or total loss of foliage—an adaptive strategy to reduce water loss through evapotranspiration.

If a heatwave persists for too long, it can lead to suffering, slowed growth, or even a complete halt in soil life. Consequently, the garden will require significant care to regain its vitality, and recovery may not always be feasible.

🤲 Protecting Your Vegetable Garden

By paying attention to signs of stress in your plants, you can implement actions that promote the protection and recovery of life in the garden.

Create temporary shaded areas using sheets or tarps suspended above your crops. This fall, consider planting heat-resistant hedges, trees, and shrubs to establish natural shade for future heatwaves.

For watering, place oyas (small clay pots) at the base of your most vulnerable plants for consistent and controlled drip irrigation. Alternatively, you can make your own using repurposed bottles with holes, buried upside down in the soil.

In anticipation of upcoming storms, set up one or more water collectors in your garden, especially at the ends of gutters or roof slopes. Lastly, mulch generously, ensuring to keep the base of each plant clear for air circulation. This will help retain soil moisture while also conserving water.

🌳 Preparing for Future Heatwaves

Best Practices

• In autumn, enrich the soil with mature compost to restore underground life, encourage microorganism growth, and support future plant development.

• Sow green manures suited to your soil and climate in summer or autumn to cover the ground throughout winter, protecting it from erosion and drying out.

• Establish natural shade areas with heat-resistant hedges and trees (such as Mediterranean species).

• Create a pond to provide cooling, hydrate the soil, and offer an additional water source for garden wildlife.

• Welcome beneficial species by leaving areas wild, sowing flowering meadows, planting hedges, or installing hedgehog shelters (check out our article on this topic!).

💧 Watering During a Heatwave

During summer, especially in periods of intense heat, it is generally recommended to water early in the morning (around 8 a.m.) or late in the evening (after 8 p.m.). If possible, favor the morning, as conditions are more conducive to deep hydration of the soil.

Less frequent but more thorough watering is preferable! Deep watering reduces daytime evaporation compared to surface watering. Space your watering sessions every 2 to 3 days on average, depending on your soil type.

If your schedule is too tight and you must water in the evening, be aware that it may be less effective. Additionally, the risk of disease development increases due to stagnant water overnight.

🦔 Beneficial Creatures in the Garden: An Indispensable Aid!

📌 Biodiversity Tip

To support small animals and insects during a heatwave, place shallow bowls of fresh water in the vegetable garden, sheltered from sun and wind, and out of reach of predators (like cats). This small gesture is vital for their survival!

Protecting beneficial creatures year-round helps prevent numerous risks in the garden—risks that are exacerbated by climate change (droughts, floods, etc.). Species such as hedgehogs, martens, moles, and owls are direct predators of many garden pests like rodents, insects, and slugs. These pests can become problematic when they proliferate, but they can be naturally regulated if we properly welcome and care for biodiversity!

🤔 What do you think…

How many aphids can ladybug larvae consume during their three-week development?

To find out the answer and continue testing your knowledge, download and print our heatwave fact sheets available on the Resources page! 👇