Stock

Stock (Matthiola incana) and evening stock (Matthiola longipetala) may sound like soup bases, but they're clove-scented biennials (plants that take two years to set seed and die) that are often grown as annuals. The dense clusters of white, yellow, red, pink, or blue fragrant flowers are favorites for bouquets. Evening stock is more sprawling, with more narrow flower petals that open in the evening.