What does a plant remember?

Plants have memory. They remember being touched. They remember droughts from previous seasons. They pass information to their offspring about environmental threats. Some plants "learn" through repeated exposure—they stop responding to harmless stimuli, conserving energy. Others remember kin and treat relatives differently than strangers. But plant memory isn't like human memory. There's no brain, no central archive. Memory is distributed through the body—in growth patterns, chemical profiles...