I found this plant in a garden near my office. I was so amused I took a picture and thought I would ask you all.
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This is an ornamental cabbage (Brassica). Conclusive identification would be possible if the plants were in flower. This has been planted with five plants in one small pot so it does not have the normal outline of leaves from top to bottom. Another way to verify the identification is to see if the topmost leaves before it starts to flower are white, pink or red.
Cabbages are biennial that flower in the second year. They do best in full sun and well drained fertile soil. When grown in hot temperatures this can speed up their cycle and move them into flowering. The list of pests and diseases is extensive and for ornamental cabbages the flowers are removed as the attraction is in the foliage.