Crossword clues for Herb having blue flowers.:BORAGEBlue-flowered herb of Mediterranean region.HAREBELLBlue-flowered herb.HAREBELLHerb having blue flowers.HYSSOPAromatic herb with blue flowersBORAGEBlue-flowered Mediterranean herbBORAGEBlue-flowered European herb.BORAGESEuropean blue-flowered salad herbs.