Plants Have Feelings

Critics of veganism argue that plants are by no means merely “insentient” organisms. They respond to environmental stimuli, communicate chemically with one another, and exhibit complex adaptive strategies. If killing animals is considered morally problematic, then harvesting and consuming plants would, by consistency, also have to be considered problematic.

1. Responses to stimuli

Plants respond to light, touch, gravity, temperature, and chemical influences. Certain plants — such as the mimosa — close their leaves when touched. Others release chemical defense substances when attacked by pests.

2. Chemical communication

Studies show that plants can emit volatile organic compounds to warn neighboring plants of herbivores. Through mycorrhizal networks in the soil, nutrients and signals can also be exchanged between plants.

3. Neurobiological analogies

Some researchers speak of “plant intelligence” or “plant communication” because plants transmit electrical signals and display complex response patterns.

From this, it is concluded: If responding to stimuli or communication are morally relevant criteria, then plants would also have to be morally considered. Veganism would not solve the problem of killing but would merely shift the victims.

The argument points to real biological phenomena. Plants do indeed respond to their environment and exhibit complex adaptive mechanisms. The decisive question, however, is not whether plants respond, but whether they have subjective experiences — that is, whether there is “something it is like” to be a plant.

1. No evidence of consciousness or pain perception

According to current neuroscientific understanding, plants possess no central nervous system, no neurons, and no structures comparable to a brain. Pain, in the biological sense, presupposes a processing system that integrates stimuli into a subjective negative experience. There is currently no empirical evidence for such a system in plants.

Responding to stimuli alone is not a sufficient criterion for consciousness. Thermostats also respond to temperature changes without “feeling” anything.

2. Criteria of moral relevance

In ethics, the capacity for suffering or conscious experience is often discussed as a central criterion for moral consideration. Even many non-vegan philosophers agree that sentience plays a crucial role.

In vertebrates, there is extensive neurobiological evidence of pain processing and consciousness. In plants, such evidence is currently lacking.

3. The consistency argument

Even if one were to hypothetically assume that plants possess some form of moral relevance, this would not automatically argue against veganism. Animal production requires large quantities of plant feed. Those who consume animals therefore generally cause the deaths of significantly more plants than those who consume plants directly.

From a purely quantitative perspective, a plant-based diet would therefore affect fewer organisms even under the assumption that plants possess moral relevance.

4. Caution with terminology

Terms such as “plant intelligence” or “feelings” are sometimes used metaphorically in popular science contexts. They should not be uncritically equated with animal or human consciousness.

Conclusion

Plants exhibit complex biological responses and communication mechanisms. According to current scientific knowledge, however, there is no robust evidence that plants experience subjective suffering or pain. Even if one were to attribute some degree of moral relevance to plants, a plant-based diet would likely affect fewer living beings due to its greater resource efficiency than an animal-based diet.