Plants can use underground communication
Plants can use underground communication to find out when neighbors are stressed.
Corn seedlings that grow close together give off underground signals that impact the growth of nearby plants, reports a study published May 2, 2018 in the open-access journal PLOS ONE by Velemir Ninkovic from the Swedish University of Agricultural Sciences, Sweden, and colleagues.
Read more at: https://phys.org/news/2018-05-underground-neighbors-stressed.html#jCp
More information: Elhakeem A, Markovic D, Broberg A, Anten NPR, Ninkovic V (2018) Aboveground mechanical stimuli affect belowground plant-plant communication. PLoS ONE 13(5): e0195646. doi.org/10.1371/journal.pone.0195646