Abstract: Improved plants of Brassica oleracea and seeds capable of forming the same are provided. Such plants are fully male and female fertile and possess the usual complement of 18 chromosomes. However, unlike previously available cole crops, these plants exhibit cytoplasmic triazine tolerance when atrazine is applied as a foliar spray at a rate of 1.5 kilograms per hectare. For the first time a triazine herbicide can effectively be used to destroy unwanted broadleaf weeds which have a propensity to grow in the same planting area with the cole crop. Accordingly, an improved process for producing a cole crop is provided through the application of triazine to the planting area.