Sea Rockets are incredible sibling plants. They can tell whether the plant next to them was sprouted from an unrelated seed or from the same mother tree.
When they sense that the foliage next to them belongs to a sister plant by using chemical signals, they don't compete with the others. But when they are in a place alone with other species, the Sea Rocket sends out more and more roots so it can become more established than its competitors.
There is a theory that plants can see, think and have some kind of communication, and this is proof. It seems that plants should be able to know what they're doing if they are able to droop when touched (The Shy Plant) or dance in the windowsill (Dancing Grass).