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By Luis Gustavo. See how we research and review our content.
A Venus flytrap keeps count. Brush one of its trigger hairs once and nothing happens; brush a second within about twenty seconds and the trap snaps shut. That small piece of timekeeping, done without a brain, is a good clue that plants are more active than they look from the garden path.
Some of what you may have read about plants is solid lab science, and some is still being argued over by ecologists. Here are 5 scientific facts about the plant world, with an honest note wherever the evidence is shakier.
1. Plants can “communicate” through chemical compounds
When attacked by insects, some plants release volatile compounds into the air that warn neighboring plants to strengthen their defenses — a type of chemical communication that’s scientifically documented. Goldenrod is a well-studied example: after a beetle larva bites it, the plant switches on its own defenses and gives off chemicals that neighboring goldenrods respond to.
Whether this counts as “communication” is a genuine question. Entomologist Rick Karban of UC Davis, who has studied the phenomenon for years, has said researchers still do not know why plants emit these cues, or whether the cues they measure are the ones neighbors actually detect. In other words, the effect is documented, but the purpose behind it is still open.
2. Some trees are connected by underground fungal networks
Research shows trees can exchange nutrients and chemical signals through networks of mycorrhizal fungi in the soil, a system sometimes called the “wood wide web.” The idea took off after a 1997 Nature paper by Suzanne Simard and colleagues, who labeled paper birch and Douglas fir seedlings with carbon isotopes and found carbon moving between the two species.
The fungi themselves are not in doubt: they partner with the roots of many plants, trading in nutrients and carbon. What is debated is how far the evidence stretches, from seedlings in a research plot to whole forests where “mother trees” nurture their offspring. The next section covers that argument.
3. Some plants can “feel” touch
Plants like the Venus flytrap physically react to touch on specific sensory hairs, snapping their leaves shut in a fraction of a second — one of the fastest responses in the plant kingdom. Each lobe carries three trigger hairs, and two touches within about 20 seconds are needed to start the trap, which guards against false alarms such as a falling raindrop.
Moving a hair releases calcium ions, and once their level crosses a threshold the trap closes in under a second as the lobes flip from convex to concave. The first closure is loose, letting tiny prey escape. Only if the captured insect keeps touching the hairs does the trap seal fully and begin digesting.
4. Plants can “orient” themselves toward light
Phototropism, the mechanism that makes plants grow toward a light source, works through plant hormones that redistribute along the stem as light exposure changes. Light-sensing proteins called phototropins pick up blue light at the cell surface, and the hormone auxin then shifts toward the shaded side of the stem.
Auxin switches on genes for expansins, proteins that loosen cell walls, so cells on the shaded flank grow longer than cells on the lit side and the stem curves toward the window. This is the same reason a houseplant leans, and why turning a pot a quarter-turn every so often keeps growth more even.
5. Some seeds can “wait” decades to germinate
Certain seed species can remain dormant in the soil for decades, or even centuries in rare cases, only germinating once the right conditions (like moisture and temperature) appear. Dormancy is a bet on timing: a seed that sprouts during a drought or a cold snap wastes its one chance, so waiting can be the winning strategy.
The record-setting example is Methuselah, a Judean date palm grown by a team led by Sarah Sallon from a seed found at Masada, the ancient fortress above the Dead Sea. The seed was estimated to be roughly 1,900 to 2,000 years old, which at the time of the 2008 report made it the oldest seed known to have sprouted.
Why the “wood wide web” is still an argument
In 2023, ecologists Justine Karst, Melanie Jones and Jason Hoeksema reviewed the field studies in Nature Ecology & Evolution. They concluded that the claims that networks are widespread, and that they boost seedling performance, were not yet adequately supported, and that no peer-reviewed evidence showed mature trees preferentially sending resources to their offspring.
Simard answered that the review looked at a narrow slice of her work and that trees communicate through several pathways, not only fungal ones. Both sides agree mycorrhizal fungi matter. The disagreement is over scope, and over how often headlines turned a promising experiment into a forest-wide rule.
The six palms that grew from the Judean desert
After Methuselah, the same group tested 34 more seeds from archaeological sites in the Judean desert, including Masada and Qumran. The seeds were soaked in water with growth hormones and planted at a kibbutz in southern Israel. Six sprouted, four male and two female, and the trees were named Judith, Hannah, Uriel, Jonah, Boaz and Adam.
The ancient seeds were larger than those of many modern varieties, hinting at a cultivated crop, and genetic analysis suggested some females had been pollinated by males from other regions. Once the female palms mature, the researchers plan to pollinate them with the ancient males.
If you’re into this kind of trivia, you’ll probably also enjoy weather phenomena and dinosaur facts.
For two creatures that depend on plants every day, see our pieces on bees and on ants.
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Six date palms now growing from seeds that sat in the Judean desert for about two thousand years are proof that, for a plant, patience can be a survival strategy.