Plants can communicate, although not in the same way we do. Some express their discontent through scents. You know that smell that hangs in the air after you've mowed the lawn? Yeah, that's actually an SOS. Some plants use sound. Yes, sound, though at a frequency that we can't hear. Researchers experimented with plants and microphones to see if they could record any trouble calls. They found that plants produce a high-frequency clicking noise when stressed and can make different sounds for different stressors. The sound a plant makes when it's not getting watered differs from the one it'll make when a leaf is cut. However, it's worth noting that experts don't think plants are crying out in pain. It's more likely that these reactions are kneejerk survival actions. Plants are living organisms, and their main objective is to survive. Scents and sounds are their tools for defending against things that might harm them.