While the idea is often framed as emotional or symbolic, scientific research suggests the issue is more technical.

Plants do not understand language, but they can respond to physical vibrations. They lack auditory organs and nervous systems. However, they possess mechanoreceptors, cellular structures that detect mechanical stimuli such as wind, touch and vibration. Sound travels as mechanical waves, and these vibrations can trigger measurable physiological responses in plant cells under controlled conditions.

Over the past two decades, multiple laboratory studies have examined how acoustic frequencies affect plant development. Research indicates that low-frequency sound waves, particularly in the 200 to 300 hertz range, may influence metabolic activity and gene expression linked to growth.

Experiments on model plants such as Arabidopsis thaliana have documented changes in protein expression and activation of growth-regulating hormones, including auxins and gibberellins, following exposure to specific sound frequencies. Some trials have reported modest increases in germination rates, chlorophyll concentration and biomass when plants were exposed to controlled acoustic stimulation compared with silent control groups.

One widely cited public experiment was conducted in 2009 by the Royal Horticultural Society in the United Kingdom. Tomato plants were placed in separate greenhouses and exposed to recorded human voices reading literary texts, including works by Charles Darwin and William Shakespeare. After several weeks, the plants exposed to recorded speech grew slightly taller than those kept in silence. Female voices produced marginally stronger growth effects.

Researchers involved in the trial cautioned that the differences were modest and not sufficient to draw broad conclusions. Fundamental growth variables such as light intensity, soil composition, water availability and nutrient balance remain the dominant factors influencing plant development. Sound exposure alone does not compensate for inadequate growing conditions.

Scientific findings in this area remain mixed. While some studies show measurable biological responses to specific acoustic frequencies, others find no statistically significant growth differences between exposed and non-exposed plants.

High-decibel noise, particularly from industrial sources or traffic pollution, may induce stress responses and inhibit development. The effect appears to depend on frequency, duration and environmental context. Recent studies suggest that plants may respond to environmentally relevant vibrations. Certain flowering plants can increase nectar production when exposed to vibration frequencies similar to those produced by pollinating bees.

Separate findings indicate that stressed plants produce ultrasonic sound emission signals that may potentially be detected by insects. These discoveries have contributed to the development of an emerging research field often referred to as phytoacoustics, which investigates plant responses to acoustic stimuli within ecological systems.

While biological effects remain limited and context-specific, the psychological dimension of talking to plants may be more substantial. Anthropomorphism, the attribution of human traits to non-human entities, is a well-documented phenomenon.

In urban environments with limited access to green space, indoor plants often serve as accessible forms of daily interaction with nature. Global consumer surveys indicate that approximately 70 to 75 per cent of houseplant owners report reduced stress after engaging in plant care activities.

Following the COVID-19 pandemic, urban gardening saw notable growth worldwide, including in Bangladesh. Rooftop cultivation, indoor gardening and online plant retail expanded as households sought activities associated with wellbeing and self-sufficiency.

From a behavioural perspective, individuals who speak to their plants may also monitor them more closely. Increased observation can lead to better watering schedules, improved light positioning and quicker responses to disease or nutrient deficiencies.

In this sense, any growth benefit may be indirectly driven by improved care rather than vocalisation itself. The current scientific consensus does not support the idea that plants comprehend speech or emotion. However, evidence suggests they can respond to mechanical vibration within specific acoustic ranges. The measurable biological impact of everyday conversation remains uncertain.

For urban households increasingly incorporating greenery into limited living spaces, talking to plants may function less as a horticultural technique and more as a behavioural practice that encourages attentiveness. While the data do not confirm that words make plants grow, they do indicate that interaction through care, monitoring and environmental management remains central to plant health.

In practical terms, consistent light, proper watering, nutrient balance and soil quality remain far more influential than speech. However, the broader research highlights an evolving understanding that plants are not passive organisms and that their responsiveness to environmental stimuli is more complex than previously assumed.