Perennial Garden Plants: What Is A Perennial

Garden and flowers
Image by Elenathewise

By Amy Grant

If you are ruminating on what to plant in your garden, re-landscaping or adding to the home landscape, you may be considering any number of perennial garden plants. What is a perennial then, and what other perennial plant facts may influence your decision?

Definition of Perennial Plants

Simply put, unlike annuals or biennials, perennials are plants that live year after year. Some perennials, such as trees and shrubs, have significant life spans. Others, like many flowering perennials, may need to be replaced every three or more years.

Some trees and shrubs retain their foliage throughout the year, but most herbaceous perennials, including many flowering perennials, die back to the ground during the first fall freezes. That is, the leaves, stems and flowers die back to the ground, leaving a dormant root structure. Upon the advent of spring, new plant tops form and the cycle begins anew. These perennial garden plants are said to be hardy, having survived a winter season.

Perennial Plant Information

Advertisement

Because perennials are considered hardy, many may be directly sown into the garden rather than starting indoors. Keep in mind that when direct sown, the plant will bloom in either the spring or summer of the second year, continuing to bloom thereafter, year after year.

Some perennials behave like annuals, just as some annuals continue to grow like perennials. Confused yet? Weather conditions and other stresses such as drought affect how long, how productive or when a plant will grow. Northern regions of the United States, with their shorter growing season and cooler temperatures, may effectively render what is categorized as a perennial into an annual. Here in the Pacific Northwest, I have had annuals bloom for a couple of years in a row due to our temperate climate since we rarely freeze for any lengthy period of time.

Annuals generally have showier flowers with season long color compared to perennials, but they need to be set out year after year while perennials keep on giving. A combination of the two may result in the longest period of blossoms with a revolving rainbow of colors.

Perennials have a shorter bloom time than annuals — about two to three weeks. However, with a little research, an entire flower bed may be filled with a variety of perennial plants, allowing for continuous blooming as one plant ends and another one flowers. Also, a clump or mass grouping of perennials may add pizzazz in a flowering garden; just keep in mind the eventual size of the cultivar.

Additional Perennial Plant Facts

Another upside to perennial plantings is the amazing varieties of color, texture and sizes available. They do require some pruning and maintenance, but their longevity makes this well worth the effort. Many perennials will retain foliage year round. Among these include not only trees and shrubs, but many types of ground cover as well.

While some perennials can be grown from seed saved from existing specimens, often the resulting plant is not true to the original. Either hybrid or strains of seed that are purchased and sown will give truer results. The list of perennials is mind boggling and each year breeders come out with additional cultivars. Check online local nurseries for plants suitable to your area.

Print This Article
This article was last updated on
Did you find this helpful?
Share it with your friends!

Additional Help & Information

Didn't find the answer to your question? Ask one of our friendly gardening experts.

Do you know anything about gardening? Help answer someone's gardening question.

Read more articles about Gardening Tips & Information.

Search for more information

Use the search box below to find more gardening information on Gardening Know How: