Arugula (Eruca Sativa) is an overwintering Brassica, which is useful for suppressing weeds and minimizing surface compaction. Even though it provides less ground cover that turnips or rape, it has more biofumigant properties.
Arugula has been found to reduce the populations of root knot nematodes when inter-cropped with tomatoes. The arugula attracts nematodes, but they cannot reproduce on its roots, so nematode populations reduce. Arugula acts both as a green manure and a nematode trap crop.