The Life Cycle of the Winter Black Truffle in Aragon

In the truffle industry, the end of the harvest is not a final stop, but a new beginning. In Aragon, the official season for the winter black truffle (Tuber melanosporum) runs from November 15th to mid-March. But what happens beneath the Aragonese soil when the markets close and the cold gives way to spring?

We enter a critical phase of subterranean reactivation, dispersal, and symbiosis that will define the quality of the next season.

The end of the season and spore dispersal (March - April)

As spring temperatures rise, truffles not harvested by dogs during winter begin to over-ripen. Instead of being lost, these truffles fulfill a fundamental biological mission: spore dispersal.

By naturally decomposing in the soil, they release millions of spores that are the seeds of the new cycle. This process of "natural sowing" is key to the perpetuation of the species in our forests and plantations.

Germination and mycelium expansion (April - May)

With the arrival of humidity and the mild climate of Aragonese spring, the fungus awakens. The spores germinate, releasing the mycelium, a network of microscopic filaments that actively spreads through the subsoil.

This is the time for the expansion phase, where the mycelium seeks out the fine roots of its host trees —primarily holm oaks and oaks— to establish a lifelong union.

The formation of mycorrhizae and primordia

When the fungus and the root meet, they form mycorrhiza, a perfect symbiotic alliance:

• The fungus provides essential water and minerals to the tree.

• The tree provides sugars to the fungus so it can grow.

Under this secret pact, primordia begin to appear: small embryonic truffles that, although still microscopic, already contain all the aromatic potential of Tuber melanosporum.

The "burn" in the field

During these months, the activity of the fungus becomes visible on the surface of the fields in Aragon. The fungus inhibits grass growth around the tree, creating a clear area known as a "burn". This phenomenon is a visual indicator that the black truffle is winning the battle for nutrients and water, ensuring an optimal environment for its development.

Expert management for the change of cycle in Aragon

As Aragon is the world leader in production, the work of the truffle grower in spring is intense. At Sentidos Truferos, we know that excellence is built now, through:

• Water management: controlling humidity to protect mycorrhizae.

• Strategic pruning: to balance the light received by the soil.

• Wildlife protection: preventing wild animals from damaging new primordia.

Different phases in summer and winter

After this spring phase, the small truffles will face summer storms to grow and will spend autumn silently maturing. All this effort will culminate, as every year, on November 15th, when the cold of Aragon reactivates the world's most sought-after aroma.

At Sentidos Truferos, we respect each phase of this biological cycle to ensure that, when the time comes, the winter black truffle that reaches your kitchen is, quite simply, unparalleled.

Frequently Asked Questions about the Truffle Cycle in Aragon

1. When does the black truffle season officially begin and end in Aragon?

The harvest season for the winter black truffle (Tuber melanosporum) in Aragon is regulated and officially runs from November 15th to March 15th. Outside these dates, the fungus enters its regeneration phase and forms new primordia underground.

2. What happens to truffles that are not harvested in winter?

 Truffles that remain in the soil after March 15th begin a process of over-ripening and natural decomposition. This step is fundamental for the ecosystem, as it allows for the dispersal of millions of spores, which will lead to the birth of new truffles in the next biological cycle.

3. Why is spring so important for the black truffle harvest?

Spring (March-May) is a critical phase because it is when symbiosis or mycorrhization occurs. With the humidity and rising temperatures in Aragon, the mycelium expands and attaches to the roots of holm oaks and oaks. It is at this time that primordia, the small truffles that will grow throughout the summer, are formed.