Today, September 21st, on Arbor Day, we celebrate more than just green beings rooted in the earth. We celebrate trees, architects of life, silent guardians of the planet's memory, and discreet companions of our existence.

Each tree is a living universe. Their roots reach deep, connecting to groundwater and the invisible fungal networks that form the so-called wood-wide web, a system of communication and nutrient exchange that sustains entire forests. Their trunks record the years like pages in a book with concentric layers that tell stories of drought, abundance, cold, heat, and resilience. Their canopies, in turn, transform sunlight into nourishment, returning to the air the oxygen that keeps us alive.

Trees are witnesses to time. Some existed before the rise of human civilization, standing as living pillars that watched empires rise and fall. Others, young, sprout on sidewalks, in backyards, and in squares, reminding us that the future is also written in green.

They offer shade on hot days, fruits to nourish bodies and cultures, wood that builds homes and knowledge, leaves that become medicine and poetry. They are masters of resilience that, even in the face of storms, flourish again and, even when cut down, often sprout again.

On this Arbor Day, I invite you to pause for a moment and listen to the silence of a tree. Rest your hand on its trunk, feel the texture of the bark, notice the coolness of the shade. There is something deeply human in recognizing that our breath is an extension of theirs.

Celebrating trees is celebrating the web of life, recognizing that we are not the owners of nature, but rather a part of it. Each preserved tree is a gesture of gratitude to future generations.

Trees are also the most beautiful metaphor for nature's patience. Nothing in them is rushed, nothing is lost... each root sinks silently into the soil, each branch stretches toward the sky, each leaf surrenders to the cycle of birth and fall, restoring life to the earth.

I'm reminded of a song that delicately conveys this natural movement of planting, tending, and waiting. It says: "We plant the seed and wait for it to grow, we water it and wait for the leaves to appear, and the roots to begin to embrace the earth below..." Just as in the song, trees teach us to respect the right timing of things, not to anticipate the dawn before daybreak, nor force a fruit to ripen before its time.

Ecological dimension

Beyond their beauty, trees are true engineers of the planet's balance. Each performs functions that sustain life in a silent but essential way.

🔸 Carbon sequestration: capture CO₂ and help curb global warming.

🔸 Photosynthesis: transform sunlight into energy, releasing oxygen.

🔸 Climate: they transpire water, feed the rain cycle and reduce local temperatures.

🔸 Solo: its roots prevent erosion and increase fertility by shedding leaves.

🔸 Biodiversity: trunks, flowers and canopies are habitat for millions of species.

Botanical dimension

But understanding trees also means delving into their internal engineering, a natural architecture that combines strength, beauty and complexity.

🔹 Roots: in addition to anchoring the plant, they store nutrients and associate with fungi (mycorrhizae) that increase the absorption of phosphorus and nitrogen.

🔹 Stem/Trunk: formed by xylem (raw sap) and phloem (processed sap). Each growth ring is a climate record.

🔹 Sheets: energy factories, where photosynthesis occurs. Microscopic stomata regulate gas exchange and transpiration.

🔹 Flowers: reproductive organs that, through pollination, ensure the continuity of the species.

🔹 Fruits and seeds: dispersal strategies with the help of wind, water or animals.

🔹 Longevity: Some species live for centuries or millennia, such as bristlecone pines, which are over 4.000 years old.

→ The tree is therefore a living masterpiece: science, history and poetry intertwined in wood, leaves and roots.

Just as the song reminds us that a seed needs time to become a tree strong enough to withstand the rain and wind, we also need to learn to trust the rhythms of life.

Today, as we celebrate Arbor Day, we honor not only its beauty, but also the natural engineering that sustains the planet's balance. May each gesture of our planting, preserving, and caring be like a song dedicated to the earth... a promise that we will be present tomorrow, and every day to come, to protect the sweet love of life that grows green all around us.