Best Biennial Flower Seeds of 2025
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Biennial flower seeds refer to a type of plant that completes its lifecycle over two years, producing flowers and seeds in the second year. These seeds are a popular choice for gardeners looking to add a touch of colour to their outdoor spaces. They come in a variety of colours and sizes, and can be planted in both spring and autumn. Biennial flowers are known for their hardiness and ability to thrive in a variety of conditions, making them a great choice for both novice and experienced gardeners alike.
At a Glance: Our Top Picks
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Top 10 Biennial Flower Seeds
Sweet William Mixed Seeds for Your Garden
The Sweet William Seeds are perfect for adding vibrant colour to your garden. You can sow these seeds indoors from February to early May, ensuring a lovely display of blooms from May to July. By planting them outdoors in May or June, you allow them to thrive in your chosen flowering location. These seeds require minimal care; simply keep them in a moist environment and avoid overcrowding. With their adaptability to various soil types, these seeds make gardening easy and enjoyable for you.
Mixed Iceland Poppy Seeds by Thompson and Morgan
Brighten up your spring garden with the Iceland Poppy Seeds. These seeds produce vibrant, saucer-shaped blooms that add a refreshing citrus touch to your outdoor space. You can effortlessly create stunning bouquets, as these poppies make excellent cut flowers. Plus, they are easy to grow, making them a perfect choice for both novice and experienced gardeners. With just one packet, you can enjoy a colourful display that will surely catch the eye.
Thompson & Morgan Dwarf Mixed Stock Seeds
Dwarf Mixed Stock Seeds by Thompson & Morgan offer a delightful addition to your garden. These seeds grow into upright spires of blooms in various complementary colours, brightening your outdoor space from late spring to early summer. Perfect for patio containers and cottage gardens, they add charm and fragrance to any setting. Additionally, their lightly scented flowers are ideal for creating stunning summer bouquets, allowing you to enjoy their beauty indoors as well.
Welldales Evening Primrose Flower Seeds
The Welldales Evening Primrose is a stunning wildflower that blooms bright yellow at dusk, making it perfect for moonlit gardens. These enchanting flowers attract nocturnal pollinators, enhancing the biodiversity of your garden. They thrive from late spring to early autumn, providing a long-lasting display of colour. Growing up to 4 feet tall, they are ideal for coastal or evening gardens, bringing a touch of beauty and resilience to your outdoor space.
Teasel Seeds for Hardy Wildflower Gardens
The Teasel Seeds by Thompson & Morgan are an excellent choice for adding architectural beauty to your garden. These hardy biennials produce stunning lilac-pink flower heads that attract beneficial insects like bees and butterflies during mid- to late summer. With their tall stature, they create a striking visual in borders or wildlife gardens. Furthermore, the large, prickly seed heads provide a vital food source for birds such as goldfinches throughout winter, making your garden a haven for wildlife. Plus, you'll receive comprehensive care instructions to help you along the way.
Thompson and Morgan Sweet Rocket Seeds
Sweet Rocket Seeds from Thompson and Morgan promise a delightful springtime display with their large lilac and purple flower spikes. These attractive blooms not only enhance your garden's beauty but also invite butterflies and beneficial insects, supporting local wildlife. You will appreciate the sweet and spicy scent that fills the air each evening, creating a lovely atmosphere. This hardy biennial can even become perennial in some soils, allowing you to enjoy their elegance year after year.
Common Evening Primrose Flower Seeds by DAMAVAND PRO
The DAMAVAND PRO Evening Primrose Seeds produce large, vibrant lemon-yellow flowers that bloom at night, adding beauty to your garden from dusk until dawn. These seeds are perfect for creating moon gardens or attracting nighttime pollinators. Additionally, the plant has a long history as a medicinal herb, with its leaves and roots being used to create soothing oils and teas for various health issues. As a fast-growing biennial, it thrives in full sun and well-drained soil, making it easy to care for.
Thompson & Morgan Wild Teasel Seed Packet
The Wild Teasel Seed Packet by Thompson & Morgan is a fantastic choice for your garden. This native wildflower not only adds beauty with its tall, spiky stems and purple-pink flowers, but it also attracts bees and other helpful insects, supporting local biodiversity. After flowering, the seed heads provide a vital food source for birds, making your garden a haven for wildlife. Additionally, the seed heads make stunning autumnal decorations for dried flower arrangements, allowing you to enjoy your garden's beauty even after the blooms have faded.
Lunaria Annua Wildflower 'Honesty' Seeds by Thompson & Morgan
Lunaria Annua Seeds by Thompson & Morgan are a delightful addition to any garden. These hardy biennials produce stunning purple-blue flowers that bloom from March to April, enhancing your outdoor space. After flowering, they develop unique silver seed pods, adding visual interest. Their sweet nectar attracts various pollinators, making your garden a vibrant wildlife haven. Supplied in a packet of 50 seeds, you'll find it easy to grow your own beautiful wildflowers.
Johnsons Canterbury Bells Flower Seeds Mix
Johnsons Canterbury Bells Seeds offer a stunning addition to any garden. With a height of 75 cm, these hardy biennial plants create a tall and upright display, perfect for creating visual interest. Their vibrant cup and saucer flowers will brighten your outdoor space, attracting pollinators and enhancing your garden's beauty. As a biennial, they will provide blooms in the second year, ensuring you can enjoy their splendour for a longer period. Planting these seeds is an easy way to elevate your gardening experience.
Frequently Asked Questions (FAQs)
1. What are biennial seeds?
Biennials are seedlings one year, flower and set seed the next year. Although their life cycle is two years, you will find that they appear continuously in your garden. The seedlings of the second year becoming the flowers of the next year and so on.
2. What is one example of a biennial plant?
biennial, Any plant that completes its life cycle in two growing seasons. During the first growing season biennials produce roots, stems, and leaves; during the second they produce flowers, fruits, and seeds, and then die. Sugar beets and carrots are examples of biennials. See also annual, perennial.
3. Do biennials self seed?
After flowering, lots of biennials will self-seed themselves around, ensuring you always have them popping up in your garden. The trick is to deliberately sow your biennials for two years running to ensure you enjoy their flowers every summer, and not every alternate summer.
4. Is it too late to sow biennials?
In general, biennials are sown in late spring or early summer, so they have a generous amount of time to bulk up before flowering the following year. Sow them each year to ensure you have a regular supply to plant out in the garden, or in containers.
During our biennial flower seed research, we found 156 biennial flower seed products and shortlisted 10 quality products. We collected and analyzed 1,892 customer reviews through our big data system to write the biennial flower seeds list. We found that most customers choose biennial flower seeds with an average price of £3.46.
The biennial flower seeds are available for purchase. We have researched hundreds of brands and picked the top brands of biennial flower seeds, including schone, Thompson & Morgan, Welldales, DAMAVAND PRO, Johnsons. The seller of top 1 product has received honest feedback from 914 consumers with an average rating of 4.9.
Toby Butcher is a Horticulturist, and he earned his title as a Master Gardener in 2016. Toby has acquired a 25-year experience as a home gardener planting, designing, grooming vegetables and flowers. He is the leader of a plant group in Durham. Toby owns a blog where he publishes articles on growing and growing your flowers at home, in a vase, or in a garden.