Getting ready for summer: mulching is the garden’s natural air conditioner

With the arrival of summer, the garden enters the most delicate period of the year. Temperatures rise, the sun becomes more intense, and the soil tends to lose moisture quickly. It is precisely during this phase that many plants begin to suffer: the soil overheats, irrigation becomes more frequent, and the natural balance of the garden weakens.

Yet, observing natural environments, an interesting detail stands out: the soil rarely remains exposed. In woods, Mediterranean scrublands, and spontaneous landscapes, the soil is always protected by leaves, small branches, organic material, and plant debris. This natural layer acts as a protective barrier that keeps the soil cooler, more stable, and more alive.

Mulching is born precisely from this principle. It is not merely an aesthetic technique or a way to “cover” the soil, but a tool capable of profoundly influencing the health of the garden. In a sense, it works like a true natural soil air conditioner.

• Why does the soil overheat so easily?
• Mulching as natural insulation
• A concrete help against drought
• Why avoid plastic in the garden and vegetable patch
• A stronger garden starts with the soil

Why does the soil overheat so easily?

Exposed soil is extremely vulnerable. During the hottest days, the soil surface can reach very high temperatures, causing rapid water evaporation and creating difficult conditions for shallow roots.

When the soil overheats:

• moisture evaporates more quickly;
• irrigation becomes less effective;
• soil microbial life slows down;
• roots suffer thermal stress;
• the soil tends to compact and become impoverished over time.

This phenomenon has become increasingly evident in recent years, especially due to prolonged heatwaves and irregular rainfall. Plants suffer not only from a lack of water, but also from the thermal instability of the soil in which they live.

Mulching as natural insulation

Applying a layer of mulch means creating a protection between the soil and the elements. This layer helps the soil maintain a more stable temperature, limiting summer overheating and reducing temperature fluctuations.

The benefit is not limited to moisture. Cooler and more stable soil allows roots to work better and promotes the presence of beneficial microorganisms, which are essential for soil fertility. Fungi, bacteria, and microfauna are part of the soil's natural balance and contribute to the dynamics of the ecosystems present in the soil. 

In practice, mulching helps recreate conditions more similar to those found in natural environments, where the soil remains protected from external agents.

A concrete help against drought

One of the most evident effects of mulching is the reduction of evaporation. By protecting the soil from direct sunlight and wind, water remains available longer in the upper layers of the soil.

This means:

• fewer irrigations;
• greater water efficiency;
• less plant stress;
• more balanced growth during the summer.

In Mediterranean gardens, where the goal is to reduce consumption and maintenance, mulching therefore becomes a fundamental design element. And a well-designed organic mulch can help keep the soil protected and more stable over time.

The simplest or single-species mulches can offer a less varied and uniform cover over time. A more varied mixture, on the other hand, creates a more heterogeneous and stable cover over time. It is precisely from this approach that the new multispecies organic mulch developed by BotanicalDryGarden is born: a plant mixture composed of over 20 selected Mediterranean species, designed to create a more varied, stable, and natural soil cover.

Why avoid plastic in the garden and vegetable patch

For years, plastic mulch has been considered a practical solution, especially in vegetable patches. However, this type of cover creates an artificial separation between the soil and the environment, preventing the natural exchange of organic matter and contributing over time to the impoverishment of the soil.

Organic mulches work completely differently: they protect the soil by gradually integrating with the natural environment of the garden. As the seasons pass, they slowly decompose, maintaining the cover of the soil surface over time. 

In a sustainable garden, the goal should not simply be to “cover,” but to protect the soil and keep it more stable over time.

A stronger garden starts with the soil

We often think about plant health by looking only at the visible part of the garden: leaves, flowers, and vegetative growth. In reality, much of an ecosystem's balance is built in the soil.

Protected soil tends to:

• retain moisture better;
• promote more stable conditions in the garden;
• require less maintenance;
• help plants withstand extreme weather.

Preparing the garden for summer therefore means starting right there: creating the conditions so that the soil can function as a stable, protected, and natural system. And perhaps this is the true role of mulching: not simply to decorate the garden, but to help it become more resilient season after season.