Peonies are perennial flowers that reach up to 3 feet tall and 5 feet wide at maturity. These plants produce fragrant flowers up to 6 inches in diameter, making them a popular choice for home gardens, according to Iowa State University Extension.
Peonies bloom in May or early June in a variety of colors, including pink, white, red and yellow. Flowers may be single, double, semi-double, Japanese or anemone in form.
Peonies bloom only once each year, even if deadheaded. Other benefits of deadheading peonies include improved appearance, increased leaf production and improved flowering next year.
Peonies produce seedpods that some gardeners find attractive, according to Oregon State University Extension. These also attract wildlife such as birds. Well-established peonies still produce flowers well when allowed to form seeds. Younger peonies require deadheading to store nutrients for future growth and flower production.