Novel Brassica napus L. var. pabularia (DC.), such as Brassica napus L. var. pabularia (DC.) designated KX-1 is disclosed. In some embodiments, the invention relates to the seeds of Brassica napus L. var. pabularia (DC.) KX-1, to the plants and plant parts of Brassica napus L. var. pabularia (DC.) KX-1, and to methods for producing a Brassica napus L. var. pabularia (DC.) plant by crossing the Brassica napus L. var. pabularia (DC.) KX-1 with itself or another Brassica napus L. var. pabularia (DC.) plant. The invention further relates to methods for producing other Brassica napus L. var. pabularia (DC.) plants derived from the Brassica napus L. var. pabularia (DC.) KX-1.