Trees are slow, like Ents. The electrical impulses that pass through trees travel at a rate of one-third of an inch per second.
Why do trees need electricity? According to Peter Wollheben (The Hidden Life of Trees), they need electricity to talk to each other.
He’s not kidding: “trees need to communicate, and electrical impulses are just one of their many means of communication. Trees also use the senses of smell and taste for communication. If a giraffe starts eating an African acacia, the tree releases a chemical into the air that signals that a threat is at hand. As the chemical drifts through the air and reaches other trees, they ‘smell’ it and are warned of the danger. Even before the giraffe reaches them, they begin producing toxic chemicals. Insect pests are dealt with slightly differently. The saliva of leaf-eating insects can be ‘tasted’ by the leaf being eaten. In response, the tree sends out a chemical signal that attracts predators that feed on that particular leaf-eating insect” (vii-viii).