Spray carnations, also known as miniature carnations, grow up to only 1 inch in diameter, with numerous miniature flowers on a single stem. They are a perennial flower that are usually grown in a greenhouse. The other flower type that has this variation is the rose. A wonderful feature of the spray carnations is that it has many interesting colours that are not available in the single, larger bloom. Spray flowers are often used as accents or filler flowers in bouquets and centrepieces.