Can plants talk? – Angela Wall

Although plants appear not to communicate by sound, they can communicate with plants and other organisms in many ways. Plants cannot run away, so In order to survive they are able to call for help, eavesdrop on neighbours, defend themselves and neighbours against herbivores and diseases, defend their territory, alert neighbours to drought conditions, recognise siblings and help each other out with nutrient transfer. This is mostly through the medium of chemicals. Plants release volatile organic compounds (VOCs) such as terpenoids into the air and soluble chemicals into the soil. The roots of trees and many plants connect to each other through networks of mycorrhizal fungal threads. These fungal networks have been termed the “wood-wide web” as it is believed to be a means of rapid communication between plants allowing nutrients to be delivered directly via the connecting threads, stimulating the production of defence chemicals in uninfected plants and a means of delivering toxic chemicals to competitors. Much interest and research is currently being directed to the “wood-wide web” with particular focus on knowledge that might benefit agriculture and horticulture.
Good You Tube documentaries on plant behaviour :
“Nature” programme “What Plants Talk About “
BBC “How Plants Communicate and Think”