When temperatures soar and the garden starts looking a little less vibrant than usual, it’s tempting to jump into action and try to rescue every wilting plant in sight. However, during a heatwave, some of the most common gardening habits can actually do more harm than good.
A few simple adjustments though can help your garden cope with hot weather and recover quickly once temperatures return to normal. Here are 10 common gardening mistakes to avoid during a heatwave.
1. Watering in the middle of the day
It may seem logical to water plants when the sun is at its strongest, but midday watering is often the least effective option. In hot conditions, much of the water evaporates before it has a chance to soak into the soil and reach the roots.
Instead, water early in the morning or later in the evening when temperatures are cooler. This allows moisture to penetrate the soil properly and gives plants a chance to absorb what they need.
2. Watering little and often
A quick splash with the hose every day might make you feel better, but it won’t necessarily help your plants. Frequent, shallow watering encourages roots to stay near the surface, where the soil dries out fastest.
A better approach is to water deeply and less often. This encourages roots to grow deeper into the soil, making plants more resilient during periods of drought and extreme heat.
3. Cutting the lawn too short
Many homeowners assume that a shorter lawn requires less water, but the opposite is often true. Closely cropped grass is more vulnerable to heat stress because the soil beneath is exposed to direct sunlight.
During a heatwave, allow the grass to remain slightly longer than usual. Longer grass helps shade the soil, reduce moisture loss and keep the lawn healthier overall.
4. Fertilising stressed plants
When plants are struggling with extreme heat, adding fertiliser can sometimes make matters worse. Fertilisers encourage new growth, which requires additional energy and water at a time when plants are already under pressure.
If plants are showing signs of heat stress, it’s usually best to wait until temperatures moderate before applying fertiliser.
5. Pruning during extreme heat
Pruning can place additional stress on plants by removing foliage that helps provide shade and regulate moisture loss. Fresh cuts can also leave plants more susceptible to scorching during intense sunshine.
Unless you’re removing damaged or hazardous branches, postpone major pruning until the heatwave has passed.
6. Planting new trees, shrubs or perennials
Heatwaves are not ideal conditions for establishing new plants. Newly planted specimens need time to develop their root systems, and hot, dry weather makes this much more difficult.
If possible, delay planting until temperatures cool down. If you’ve recently planted something new, keep a particularly close eye on its watering requirements, as young plants are often the first to suffer.
7. Forgetting about pots and containers
Container plants can dry out remarkably quickly during hot weather. While plants growing in borders can access moisture deeper in the soil, those in pots are limited to the compost around their roots.
Check containers regularly during a heatwave, particularly those positioned in full sun. In some cases, they may need watering twice a day. Grouping pots together or moving them into partial shade can also help reduce water loss.
8. Leaving soil bare
Bare soil loses moisture much faster than covered soil. One of the simplest ways to help your garden cope with hot weather is by applying a layer of mulch around plants.
Organic mulches such as compost, bark or well-rotted manure help lock in moisture, regulate soil temperature and suppress weeds that compete for water. Think of mulch as a protective blanket for your garden during extreme weather.
9. Not noticing signs of heat stress
It’s normal for some plants to look a little droopy during the hottest part of the day, even when they have sufficient moisture. However, persistent wilting, scorched leaves, browning edges or premature leaf drop can indicate a more serious problem.
Take time to monitor vulnerable plants, particularly newly planted specimens, hydrangeas, vegetables and container displays. Catching problems early often makes recovery much easier.
10. Expecting the garden to look perfect
Perhaps the biggest mistake of all is expecting your garden to look as lush and pristine during a heatwave as it does in spring.
Gardens are living spaces, and plants naturally respond to changing weather conditions. A little browning, slower growth or temporary wilting is often perfectly normal during periods of extreme heat.
Heatwaves can be tough on gardens, but a calm and measured approach is often the best solution. Water deeply, avoid unnecessary stress on plants and resist the urge to overreact to every drooping leaf.
By avoiding these common mistakes, you’ll give your garden the best possible chance of staying healthy throughout the hottest days of summer.
