 These results implied that the drought signal was relayed to plants five pots away from the stress origin.Neighboring plants placed in separate pots directly next to Pot A showed no changes in stomatal aperture, which confirmed that the drought signal spread through the roots and soil, not through the air as a volatile chemical signal.Novoplansky and his team concluded that information about environmental conditions must be communicated through root systems, implying that plant communication occurs among roots of the same plant and nearby plants as well.