Biennial wildflowers combine the qualities of annuals and perennials. These wildflowers live for two years but won’t flower in their first year. In this article, we’ll look at ten popular types of biennial wildflowers.
About Biennial Wildflowers
Biennial wildflowers are one of the three main flower categories, along with annuals and perennials. Biennial wildflowers only live for two years.
Like perennials, biennial wildflowers won’t bloom in their first year while they develop strong root systems. Biennials bloom in their second year and have a long flowering season like annuals. Biennials die off completely once flowering finishes but often self-seed.
Biennial wildflowers only require a little maintenance as they naturally die back to their roots in their first year. Biennials can be pulled up after flowering and self-seeding in their second year.
10 Popular Types of Biennial Wildflowers
1) American Bellflower
Also known as tall bellflowers, American bellflowers are annual or biennial wildflowers from the Campanulaceae family. American bellflowers are native to central and eastern areas of North America.
American bellflowers have gorgeous tall flower spikes covered in light blue star-shaped flowers. Each flower has a white center and is about an inch wide.
American bellflowers grow best in USDA Zones 4 to 7. These attractive biennials require full sun or partial shade and moist, well-draining soils.
| Scientific Name: | Campanula americana |
| Height: | 3 to 6 feet |
| Flowering Season: | Summer |
| Light Requirements: | Full sun or partial shade |
| Soil Preferences: | Moist, well-draining soils |
2) Common Evening Primrose
Common evening primroses are gorgeous types of biennial wildflowers native to central and eastern parts of North America. It belongs to the Oenothera genus in the evening primrose family (Onagraceae).
Common evening primroses produce clusters of yellow flowers with four petals. The flowers emerge from tall flower spikes. Each flower only lasts for a single day after opening in the evening.
Common evening primroses need full sun or partial shade and moist, well-draining soils. These pretty biennials thrive in Zones 4 to 9.
| Scientific Name: | Oenothera biennis |
| Height: | Up to 5 feet |
| Flowering Season: | Summer to fall |
| Light Requirements: | Full sun to partial shade |
| Soil Preferences: | Moist, well-draining soils |
3) Forget-Me-Nots
Forget-me-nots are biennial or perennial wildflowers native to Eurasia and the Americas. They belong to the Myosotis genus in the borage family.
Forget-me-nots have beautiful star-shaped flowers with five petals and yellow centers. These small flowers come in blue, white, pink, or yellow and are popular with pollinators.
Forget-me-nots grow best in Zones 3 to 8 and make excellent ground cover plants. These pretty little plants need full sun or partial shade and moist, well-draining soils.
| Scientific Name: | Myosotis spp. |
| Height: | Up to 1 foot |
| Flowering Season: | Spring to summer |
| Light Requirements: | Full sun or partial shade |
| Soil Preferences: | Moist, well-draining soils |
4) Foxgloves
Foxgloves are beautiful types of biennial wildflowers that belong to the Digitalis genus in the plantain family (Plantaginaceae). These colorful flowers are native to parts of Africa, Asia, and Europe.
Foxgloves produce tall stalks covered in thimble-like flowers that are popular with bees. Foxgloves can be pink, purple, white, or yellow. The insides of the flowers often have spot-like markings.
Foxgloves need well-draining loamy soils and full sun or partial shade. Foxgloves are hardy to Zones 4 to 10.
| Scientific Name: | Digitalis spp. |
| Height: | 2 to 5 feet |
| Flowering Season: | Spring to summer |
| Light Requirements: | Full sun or partial shade |
| Soil Preferences: | Well-draining soil |
5) Hollyhocks
Hollyhocks are dramatic types of biennial wildflowers native to Eurasia. These towering flowers come from the Alcea genus within the mallow family (Malvaceae).
Hollyhocks grow up to 8 feet tall and produce masses of pink, purple, white, or yellow flowers. Each flower can be up to 4 inches wide. These large flowers are perfect for attracting bees.
Hollyhocks thrive in Zones 2 to 10 and can tolerate cold temperatures. Hollyhocks require moist, well-draining soils and full sun or partial shade.
| Scientific Name: | Alcea spp. |
| Height: | Up to 8 feet |
| Flowering Season: | Summer |
| Light Requirements: | Full sun or partial shade |
| Soil Preferences: | Moist, well-draining soils |
6) Honesty
Honesty is a pretty biennial wildflower from the cabbage family (Brassicaceae). These attractive flowers are known for their translucent oval seed pods. Due to these seed pods, honesty is also known as moneywort or silver dollar plants.
Along with the seed pods, honesty also produces clusters of gorgeous purple or white flowers. The flowers have a beautiful fragrance.
Honesty needs full sun or partial shade and moist, well-draining soils. These biennials grow well in Zones 5 to 9.
| Scientific Name: | Lunaria annua |
| Height: | 2 to 3 feet |
| Flowering Season: | Spring to summer |
| Light Requirements: | Full sun or partial shade |
| Soil Preferences: | Moist, well-draining soils |
7) Sweet William
Sweet William are colorful types of biennial wildflowers native to southern Europe. These attractive flowers come from the Dianthus genus within the carnation family (Caryophyllaceae).
Sweet William produces clusters of small, bi-colored flowers with frilled edges. Common color combinations include red and white or shades of pink and purple. The flowers have a faint scent of cloves.
Sweet William thrives in Zones 3 to 9. These biennial wildflowers need moist, well-draining soils and full sun or partial shade.
| Scientific Name: | Dianthus barbatus |
| Height: | Up to 2 feet |
| Flowering Season: | Spring to summer |
| Light Requirements: | Full sun or partial shade |
| Soil Preferences: | Moist, well-draining soils |
8) Teasels
Teasels are unusual biennial wildflowers from the Dipsacus genus of the honeysuckle family (Caprifoliaceae). Teasels are native to parts of Africa, Asia, and Europe.
Teasels have large thistle-like flower heads with tiny blue, purple, or white flowers. The middle flowers bloom first before the flowers above and below emerge in a sequence.
Teasels are adaptable plants that thrive in most well-draining soils. They also need full sun or partial shade and grow best in Zones 3 to 9.
| Scientific Name: | Dipsacus spp. |
| Height: | 3 to 8 feet |
| Flowering Season: | Summer |
| Light Requirements: | Full sun or partial shade |
| Soil Preferences: | Most well-draining soils |
9) Viper’s Bugloss
Viper’s bugloss is a biennial or perennial wildflower native to parts of Eurasia. These wildflowers have also been introduced to North America. Viper’s bugloss belongs to the borage family.
Viper’s bugloss has tall flowering spikes filled with tiny blue flowers. The flowers are pink when they first bloom before turning blue. Viper’s bugloss also produces blue pollen.
Viper’s bugloss requires full sun and grows in most types of well-draining soils. These nectar-rich biennials thrive in Zones 3 to 8.
| Scientific Name: | Echium vulgare |
| Height: | 1 to 3 feet |
| Flowering Season: | Spring to fall |
| Light Requirements: | Full sun |
| Soil Preferences: | Well-draining soils |
10) Wallflowers
Wallflowers are perennial wildflowers that grow as biennials in gardens. Wallflowers belong to the Erysimum genus in the cabbage family.
Wallflowers have four-lobed petals that come in blue, purple, orange, red, or yellow. These colorful flowers are adaptable enough to grow through cracks in walls, hence the name. Some wallflowers also produce sweet scents.
Wallflowers thrive in Zones 6 to 10 and need loose, sandy soils and full sun or partial shade.
| Scientific Name: | Erysimum spp. |
| Height: | 1 to 3 feet |
| Flowering Season: | Spring to fall |
| Light Requirements: | Full sun or partial shade |
| Soil Preferences: | Loose, well-draining soils |
Popular Types of Biennial Wildflowers FAQs:
Do Biennials Only Last Two Years?
Biennial wildflowers only live for two years before self-seeding and dying off completely. Biennials won’t flower in their first year.
What Are Some Examples of Biennial Plants?
Examples of biennial wildflowers include American bellflowers, common evening primrose, and foxgloves.
What is a Hardy Biennial Plant?
Hardy biennial wildflowers can survive in cooler climates. Hardy biennials still only live for two years and won’t flower during their first year.
Wrapping Up
Biennial wildflowers live for two years and won’t flower in their first year while they develop their root systems. Many types of biennial flowers enjoy a long flowering season in their second year. Common biennial wildflowers include foxgloves, teasels, and common evening primrose.
Edd is a budding content writer and gardener living in the United Kingdom. He has a bachelor's degree in Creative and Professional Writing and has written for several gardening publications online. He is passionate about nature and sustainability with a focus on gardening and wildlife.
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