Insects that turn out to be severe on cabbage most likely also infest close by mustard, broccoli, and collards, but they might not unfold to cabbage planted on the other side of the garden. If an insect lays eggs or in any other case attacks a species, the presence of unrelated plants within the area can interrupt the attack’s progress by diluting the attractive odor of the popular crops. Interplanting can even gradual the spread of illnesses, giving the gardener more time to develop a management technique. Marigolds and garlic are two vegetation really helpful as insect repellants; however, most of these suggestions are unproven. In some cases, the evidence indicates these plants are not efficient repellants. Planting two comparable crops in successive years tends to increase pest issues.