Dwarf Essex Rape Seeds : Dwarf Essex Rape is a fast growing brassica plant used extensively in home vegetable garden, deer food plots and for livestock grazing. Rape is a fast growing plant that produces large flat leafs that will grow between 12 to 18 inches long and 8 to 14 inches wide and may grow to a height of two to four feet. Rapeseed also can be used effectively as a winter cover crop.