19 points
Did some searching. The paper from 2019 that discussed this -
We recorded 65 dBSPL (dB of sound pressure level) ultrasonic sounds 4 inches (10 cm) from tomato and tobacco plants, implying that these sounds could be detected by some organisms from up to several feet (meters) away.
https://www.sci.news/biology/plants-ultrasonic-clicks-07895.html