When someone touches you your energy is transmitted to them. Even negative too. Ever go someplace and you want to leave. We feel energy. Bad and good.
Hold someone's hand after reading this and pay attention. It's like a jolt of warm energy comes through your veins. It's amazing. Truly is!
Although not sure about the plant similarities I will say that we feed off eachother's energy.
Article:
Science Confirms That People Absorb Enery From Others