COLORFUL PERENNIAL is a term used to describe plants that are both colorful and perennial, meaning they bloom year after year. Two examples of this type of plant are the ASTER and DAHLIA, both of which have five and six letters respectively. The Irid is another example of a colorful perennial, with four letters. All three of these plants are known for their bright and vibrant colors, making them popular choices for gardens and flower beds.