According to the surprisingly still active Slashdot, Researchers Discover New Plant “Language”:
Westwood examined the plants’ mRNA, the molecule in cells that instructs organisms how to code certain proteins that are key to functioning. MRNA helps to regulate plant development and can control when plants eventually flowers. He found that the parasitic and the host plants were exchanging thousands of mRNA molecules between each other, thus creating a conversation.
Ah! Clarity. For a loose definition of language and conversation. I’m ok with loose definitions, a good analogy can help open the mind to new possibilities and potentialities. But I’m still happy to mock a little.