This project, launched by the European Union, aims at raising awareness on climate change and marked World Environment Day.
The event was initially scheduled to take place on June 5, but was pushed back due to bad weather.
The sisters wore two simple matching outfits – white shirts, blue jeans and hiking boots – and face masks.
Princess Leonor and Infanta Sofia carried out their first engagements without their parents
Princess Leonor will move to the UK in August to attend a college in Wales
On their shirts, they also pinned a badge of the campaign they were taking part in.
After a brief lesson focused on the environment and the task to follow, the royals split to join two groups of six teenagers who worked together to plant trees, pour soil in the hole and water the plant.
While Leonor and Sofia were spending time outdoors, King Felipe was visiting the school of navy officers in Cadiz.
This key event in the royal life of the sisters took place a few months after Princess Leonor, who will one day follow her father on the throne, carried out her first-ever solo engagement.
Princess Leonor and Infanta Sofia took part in the A tree for Europe initiative
Before depositing the copy of the Constitution, Princess Leonor read its first article.
Leonor also handed over a copy of Miguel de Cervantes’ Don Quixote from which, during the first months of lockdown in 2020, she and her sister had read extracts for a video message.
During her first solo visit, Leonor also heard about the impact the pandemic had on the institution and its goal of spreading Spanish culture around the world.
The initiative aimed at raising awareness on climate change
Princess Leonor and Infanta Sofia planted trees
Princess Leonor and Infanta Sofia became regular attendees at key royal events in Spain following the abdication of King Juan Carlos in 2014.
The engagement in Madrid is likely to be Princess Leonor’s last public appearance before she moves to the UK in August.
The royal will take part in a two-year International Baccalaureate programme at the UWC Atlantic College in the Vale of Glamorgan in Wales.
The course will cost £67,000 and will be paid for entirely by King Felipe.
The institution was created in 1962 by German educationalist Kurt Hahn, who also founded Gordonstoun boarding school in Scotland, the college famously attended by Prince Philip, Prince Charles and other key royals.
The college is particularly popular among young European royals.
Princess Leonor will be joined in August by Princess Alexia of the Netherlands, who is the second daughter of King Willem-Alexander and Queen Maxima.
Princess Leonor with her father King Felipe V
One year later, Elisabeth is completing a course in social and military sciences at the Royal Military Academy in Belgium.
Her father King Philippe attended the same school for three years.
Source: EXPRESS CO UK