Biennials comprise some of the most beautiful flowers in the landscape. Biennials include such lovely flowers as hollyhocks, sweet william (also called dianthus), and foxglove. But what exactly is a biennial and how do you grow it?
What is a biennial?
To answer the question, “What is a biennial?”, it may help to first define the other types of flowers that are more well known. Annuals are flower that must be planted every year. They grow, set seed, and die within the same season. They don’t come back. Perennials are flowers that grow, flower, die back to the ground, and come back the following year and the year after and so on.
Biennials are odd in that they combine the behaviors of both annuals and perennials. Biennials sprout from seed the first year. The plants focus all their energy on growing sturdy roots and healthy greens but will not flower during the first year of growth. Biennials will then die back to the ground for the winter and come back the following spring. In the second year of growth, the biennials create a stunning display of flowers and set seed. After setting seed, biennial plants die completely and don’t come back. So a biennial grows the first year and dies back to the ground for the winter like a perennial. The following year the biennial will flower, set seed, and die, root and all, like an annual.
How do you grow a biennial?
Because of the interesting growing behavior of biennials, there is a trick to growing them. In order to have beautiful flowers every year when you start biennials, plant biennials by seed for two years consecutively or plant potted biennials for several years in a row. Thereafter, either let the seeds fall to the ground or collect the seeds to reseed the following year. This means do not deadhead your biennial flowers. Instead, allow the flower head to dry up and collect the seeds to replant the following season or allow them to drop to the ground so the plant reseeds itself. This process of planting will give you a never ending supply of biennial flowers year after year after year.
How are biennials special?
Biennials are a special type of plant. They have a fascinating mix of annual and perennial growth behavior. In order to have their flowering presence in the garden every year, the gardener must follow a special process. However, biennials are well worth the effort. They have some of the most beautiful flowers of any garden plant.
Quote of the Day
Shed no tear! O shed no tear!
The flower will bloom another year.
Weep no more! O weep no more!
Young buds sleep in the root’s white core.
-John Keats, English poet