If you are looking for variety, you have come to the right flower. There are over 700 species of this plant that originated in warm and temperate climates. There are annual and perennial varieties aplenty.
Spiky flowers are borne on bushy plants. Sizes generally range from 10" to 60", with most varieties below 36". You most likely know, and readily recognize, the bright red and scarlet Salvia. But, the flowers are also found in most colors, including blue.