Buzz
Trees often go unnoticed because they seem so still and uneventful—until you take a closer look. Then, they reveal themselves in strange and fascinating ways. From their surprising ways of communicating with other living beings to the extreme actions they take to protect their survival, trees certainly deserve a new level of admiration and respect.
10. They Detonate
Imagine a sadistic military designer with a twisted sense of humor creating a plant—this would be the sandbox tree. Poison resides in almost every part of its leaves, bark, and pumpkin-shaped seeds. Its towering 30-meter (100 ft) trunk is covered in sharp thorns, keeping even the most determined tree-huggers at bay. But the real danger lies in its seeds, which explode with such force that they can injure both people and animals. While this explosive mechanism helps the tree scatter its seeds up to 40 meters (130 ft) away, it’s the speed of the ejection that makes it deadly.
With speeds of up to deadly 240 kilometers per hour (150 mph), a nearby cow or person could be “shot” and suffer serious injuries. If, for some unfathomable reason, someone tries to eat the explosive seeds, they can cause vomiting and diarrhea. The tree sap is also particularly destructive, ruining everything it touches. It induces painful skin rashes and can even cause blindness. One thing is certain: The sandbox tree is definitely not the type of plant you’d keep indoors.
9. They Hire Bodyguards
It’s pretty clear that a tree, being just a lump of trunk, can’t fend off animals looking to nibble on it. But that doesn’t mean trees are defenseless—they’re known for hiring bodyguards, and nothing sends a hungry herbivore running like an ant in its face.
The acacia tree has its own army of hostile ants, which it rewards with both shelter and special food. And this isn't just any ordinary food—it’s packed with protease inhibitors, molecules that prevent insects from digesting protein. This makes it a dangerous and unappetizing meal for most bugs. However, the tree’s ant army is unaffected by this and finds it very nutritious. It’s a mutually beneficial arrangement: The tree provides shelter and exclusive food for the ants, and in return, the ants fiercely defend the tree from harm.
8. Self-Sacrifice
A newly discovered palm tree must give up its life in order to reproduce. These trees expend so much energy to attract pollinators that they have nothing left to sustain themselves, and they die shortly after producing fruit. Cashew farmers in Madagascar’s Analalava district stumbled upon this astonishing find and were amazed by its enormous size. The 18-meter (58.5 ft) trunk and wide 5-meter (16 ft) leaves create a pyramid-shaped plant so large it can be seen from space.
The blooming phase is the palm’s point of no return. Hundreds of tiny flowers cover the stem tip when the tree begins its inevitable cycle, and these flowers are loaded with nectar that successfully draws in the right birds and insects. Every single flower can be fertilized, which likely contributes to the palm’s inability to survive the mass fruiting. It literally sacrifices its own nutrients to create the next generation. This adds an even stranger layer to Madagascar’s already bizarre wilderness.
7. They Touch Immortality
Trees are among the oldest living organisms on Earth. When placed in ideal conditions, there seems to be no limit to their age. A spruce tree still alive in Sweden today (shown above) began as a seedling at the end of the last ice age. At first glance, this “Christmas tree,” which is 9,550 years old, may seem underwhelming. Discovered in 2004, the Norway spruce stands about 4 meters (13 ft) tall, looking like any young tree, but the secret to its age is its remarkable ability to clone itself. When its trunk dies, a new one grows from the ancient roots, which are the true source of its age.
Mount Etna in Sicily is home to the world's oldest chestnut tree, a tree that may be as old as 4,000 years and holds the Guinness World Record for the largest girth, with a circumference of 58 meters (190 ft). Meanwhile, some bristlecone pines from California’s White Mountains have been standing tall for up to 5,000 years and are still thriving. With such incredible longevity, it’s a stark contrast to the reality that trees in cities typically live only about 13 years.
6. Produce Their Own Fertilizer
Researchers have uncovered a fascinating new ability in trees that have been cut down. Somehow, the remaining stump is able to draw nitrogen from the air and use it to fertilize the ground around it, enriching the soil with this vital nutrient for plants. Trees in tropical forests, in particular, are quite adept at this process. After being logged, they also capture carbon from the atmosphere, giving them a better chance of recovery.
And these trees aren’t selfish with their newfound nutrients. They release them into the surrounding area, allowing nearby plants to benefit from the captured nutrients as well. This remarkable ability to draw nitrogen from the air is something trees can activate or deactivate depending on their needs, but it’s a trait found in only certain species. In the early stages of forest regeneration, the difference between species that can do this and those that can’t is striking. Species that lack this ability gain carbon weight up to nine times slower than their nutrient-absorbing counterparts.
5. Sever Their Limbs
Trees cannot heal physical wounds the way humans do. In order to stay alive and healthy, trees must conserve energy, and healing would be an expensive drain on their resources. Instead of bandaging the injury and hoping for recovery, the tree shuts down all life to the damaged area, essentially abandoning it. This strategy has two key advantages: it prevents potential threats from spreading and allows the tree to channel its energy into new growth elsewhere.
However, amputation is not a guaranteed solution. Sometimes the damage is too extensive or the wound becomes infected, leading to the tree’s eventual demise. But when the tree's defense works, the affected cells leak their contents, which then oxidize and form a protective barrier. Over time, the wound gradually heals as new growth forms around it each year.
4. They Make Audible Sounds
French researchers have captured a sound that trees emit when they experience drought stress. No, trees don’t plead for water in a raspy voice—they bubble. But by the time they start emitting these ultrasonic “bloop-bloops,” a dangerous process is already in motion, one that could be fatal for the unfortunate tree.
To transport water to all their parts, trees draw the vital liquid—under pressure equivalent to several atmospheres—through special tubes called xylem. During a drought, the plant must increase this pressure, but this leads to the formation of air bubbles that disrupt the water flow. These bubbles create the stress sounds now detectable by specialized microphones.
Scientists refer to this phenomenon as “cavitations,” and since an excess of cavitations can prove fatal to trees—sometimes even threatening valuable plantations—it’s essential to monitor when they occur. The French researchers aim to develop a device that captures these ultrasonic sounds, which would allow forest managers to know when a tree requires emergency watering or even trigger an automatic irrigation system.
3. Arson as a Competitive Strategy
Affectionately called “gasoline trees,” the eucalyptus tree is almost purpose-built to facilitate a devastating wildfire. The wide strips of dry, peeling bark act as tinder all around the tree, made even more perilous by the highly flammable oils the tree produces.
This combination makes the eucalyptus tree a nightmare for firefighters, capable of transforming a manageable ground fire into an uncontrollable blaze in minutes. In 1991, eucalyptus trees ignited wildfires that resulted in the destruction of over 3,000 homes and the loss of 25 lives in the Oakland Hills of California. After such catastrophic fires, eucalyptus saplings flourish effortlessly. In their early years, these young trees grow vigorously, sometimes outpacing other species that struggle to keep up. Despite their destructive nature, eucalyptus trees are highly sought after for their unique beauty, rapid growth, and valuable essential oils.
2. The Language of Leaves
Perhaps the word “leaves” isn’t quite accurate here. Trees don’t use sign language with their leaves to greet one another—that would be a bit unsettling. Instead, trees communicate in a more subtle and hidden way, beneath the surface. Forest ecologist Suzanne Simard made a groundbreaking discovery showing that trees share resources and communicate through their roots. With the help of symbiotic fungi, trees can even nourish seedlings, providing them with the essential nutrients they need to grow.
This fungal network also enables larger trees to exchange vital resources like water and carbon with their neighboring trees, adjusting to their needs. Simard also identified the concept of “mother trees”—the ancient and towering trees that anchor the forest. These trees are not only connected to all others but serve as the forest's central control point. They regulate and distribute resources through the expansive fungal web, and when such a matriarch is felled, younger trees face a much higher risk of survival challenges.
1. Molecular Memory
In an intriguing study involving genetically identical poplar trees, researchers discovered that these trees reacted to their surroundings based on past experiences, indicating a form of molecular memory. The experiment involved taking stem cuttings from poplars, with the only difference being the origin of the cuttings from two separate nurseries. Everything else was controlled—the genes, species, and environment were consistent to ensure the experiment could reveal any differences in the trees’ reactions. And that’s exactly what happened.
To simulate drought, the scientists watered some trees while depriving the others of water. Given that the trees were essentially genetic clones, the researchers expected them all to react in the same way. However, the poplars from Alberta activated a different set of genes in response to the drought compared to the trees from Saskatchewan. This suggested that the trees had some form of “memory” tied to their origins.
