Why their memory and communication matter for our health
Plants can “remember”
Plants have a kind of memory. For example, sunflowers track the sun throughout the day, return to their starting position at night, and anticipate sunrise even in total darkness. Similarly, albizia tree leaves open and close in rhythm with daylight cycles, continuing their movement even when placed in a dark environment.
Certain species of seeds have been shown to “remember” the daylight conditions their parent plants experienced, which determines when they germinate. In some cases, these memory-driven adaptations last for decades, helping to ensure survival in specific environmental conditions.
Plants as timekeepers
Beyond memory, plants also display a remarkable ability to measure time. Some seeds require specific night lengths to trigger germination, demonstrating an internal biological clock. For instance, begonia seeds will not sprout unless nighttime darkness falls below a particular threshold.
Other plants, like bamboo, seem to take timekeeping one step further. Certain varieties bloom and die in synchronization across the globe despite growing in different conditions. This finding suggests an innate, built-in calendar that spans years or even decades.
Plants communicate through chemical signals
Perhaps the most fascinating discovery has been that plants “talk” to one another (and to other organisms) through chemical signals. When attacked by herbivores, plants release airborne compounds that act as distress signals, warning neighbouring plants to activate their defenses. Some even enlist the help of insects. When under threat, certain plants emit chemicals that attract predatory insects to eliminate their attackers.
Many plants use specific chemical compounds to attract pollinators. Some even mimic pheromones or give off scents resembling rotting meat to trick insects into visiting. Others, like the skunk cabbage, generate heat to amplify their scent and attract pollinators.
What this means for us
Understanding plant “intelligence” can reshape the way we interact with nature. Here’s how these findings can be applied in practical ways.
Better nurturing and relating to plants
If plants are capable of memory and communication, how we care for them matters. Recognizing their ability to respond to environmental cues can help us cultivate healthier, more resilient plant life.
Designing healthier spaces
Urban planners are increasingly implementing research that suggests green spaces improve air quality, reduce stress, and enhance well-being. They’re betting that urban environments that integrate plants with known adaptive behaviours into their designs can benefit residents in multiple ways.
Creating therapeutic environments
The presence of plants has been shown to lower anxiety and boost mood. Understanding plant behaviour could inform how we design healing spaces, such as hospitals and therapy rooms.
As plant research continues, we may uncover even deeper insights into their cognitive-like abilities. Recognizing plants as active participants in ecosystems, not just as resources, can help us create more sustainable, healthy, and harmonious environments for both humans and plants alike.
By Adam Meyer
