Whispering lilies come in pairs and grow within a day or two after being planted. When only one bulb is planted, both plants in a bonded pair appear white, but change color when the other half of the pair is planted. If the one plant dies, then the other also withers and dies. When the matching lily is planted, the first changes color so that anyone monitoring it will know to listen to it
The most interesting use of these flowers is that their roots transmit communication that can be only be heard and interpreted by the bulb's other half. Speak into an open flower, and the message comes out of its twin.