Re: If human and animals communicate, do plants also communicate?

Plants can communicate, in a way, with other plants using volatile chemicals, 
such as methyl jasmonate. When a plant is damaged, as when an insect chews on 
it, it may release chemicals that cause other plants to defend themselves. 
The "communication" may be accidental because it seems that the damaged plant's 
main purpose is to stimulate its own defenses.

When damaged, some plants even produce chemicals that attract beneficial 
insects. For example, corn being eaten by armyworms releases a chemical that 
attracts a predatory wasp, which lays its eggs inside the armyworm. When the 
eggs hatch, the wasp larva eat the armyworm.

Tree roots often naturally graft one to another so in that case chemical 
communication might occur through the connected root systems. A chemical signal 
that promotes flowering can be transmited across a graft union. 



References


Plants Eavesdrop on Their Neighbors


Plant Communication


Methyl jasmonate is blowing in the wind, but can it act as a plant-plant 
airborne signal?


Methyl jasmonate


Root grafting