The lovely perfume of Rocket's flower is only given off in the evening. Leaves picked before it blooms The leaves of Wild Rocket are used for the same purpose as Salad Rocket. It has a much stronger taste than its close relative, Eruca sativa ‘Salad Rocket' and can be easily distinguished by its more deeply divided leaf shape. Wild rocket is a hardy perennial, but is often grown as an annual. It has green, deeply divided aromatic leaves that form a rosette as the plant matures.