Mixing up your rockets
Confusion can arise over species as the same common names may be used for annual and perennial forms.
The rocket most often cultivated and used in salads is the annual, known as Eruca sativa ( syn. E. versicaria subsp
sativa), variously known as arugula, rucola or roquette.
A perennial form, Diplotaxis tenuifolia, is often gathered in the wild in Italy. It is also referred to as Italian wild arugula, rustic arugula and perennial wall rocket. It’s slower growing than the annual type and favoured by some for its stronger flavour and richer nutrient content.
Confusingly, both species may also be called ruchetta, and the perennial species is best treated as an annual as it develops deep roots underground that will take over if allowed to spread.