Apoplast
Carnivorous Plant Addict
Seems the action potentials that cause VFT leaves to close produce enough of a magnetic field that it can be measured!
For those who want to read the press release:
For those that want the original study:
For those who want to read the press release:

Venus flytraps found to produce magnetic fields: Physicists use atomic magnetometers to measure the biomagnetic signals of the carnivorous plant
The Venus flytrap (Dionaea muscipula) is a carnivorous plant that encloses its prey using modified leaves as a trap. During this process, electrical signals known as action potentials trigger the closure of the leaf lobes. An interdisciplinary team of scientists has now shown that these...
www.sciencedaily.com
For those that want the original study: