Mulching benefits are most obvious when the heat hits. Research shows that bare soil can swing more than 20°C in a single day, while mulched soil stays much steadier, fluctuating by only about 5°C. This means it remains cooler in summer and warmer in winter. A more stable root zone helps plants cope with temperature fluctuations, reducing heat stress during summer extremes and cold during winter.
Mulching benefits: Keep soil cool
A generous 5 to 7 cm layer of mulch shields the soil from harsh sun, helping maintain steady temperatures that support strong, healthy root growth.
Reduce moisture loss
Mulch dramatically cuts moisture evaporation. Studies regularly show a 25 to 50 percent reduction in soil moisture loss when organic mulch is applied. More water stays where your plants need it, in the soil, rather than fading into the air.
Improve plant resilience
Stable temperatures and better moisture retention help plants cope with extreme weather, making gardens more resilient through summer heatwaves and winter chills.
Save time and water
With mulch doing the hard work of cooling, insulating and retaining moisture, you enjoy happier plants and less watering to do.
The coolest garden upgrade
If you want a healthier, easier garden, mulching is one of the simplest and most effective upgrades you can make.
Find out more on the stages of the mulch life cycle.
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