The term 'spiky flower' can be broken down into three crossword solutions: Lupin (5 letters), GLAD (4 letters), and Foxtail (7 letters). Lupin is a genus of flowering plants in the legume family, which includes many species of annual and perennial herbaceous plants. Gladiolus, commonly known as the GLAD, is a genus of perennial cormous flowering plants in the iris family. Foxtail is a common name for several grasses that have spikelets resembling a fox's tail. All three of these plants are spiky flowers, making them perfect solutions for the term.