Best Summer Flower Seeds of 2025

The Masterpiece Rococo Mix Pansy from Premier Seeds Direct is designed for vibrant blooms. To enjoy the earliest colour, sow the seeds indoors 6 to 8 weeks before the last frost. This allows you to have beautiful flowers early in the season. Germination takes between 10 to 20 days, and keeping the soil moderately moist during this time is essential. If you prefer later blooms, you can sow directly outdoors in mid-spring once the risk of frost has passed, providing flexibility for your planting schedule.

The Lupin Russel Strain Seeds from Premier Seeds Direct are ideal for your garden. They take up to 30 days to germinate, giving you ample time to plan your planting. You can sow three seeds per pot from early spring to late summer, making it easy to manage your garden schedule. These plants thrive in full sun or partial shade, ensuring they receive the light they need. Once seedlings reach 2 to 3 inches, you can thin them to create space, which helps promote healthy growth.

The Happy Green Shop Lobelia is a fantastic choice for garden enthusiasts. These seeds are easy to start and grow quickly, making them ideal for beginners. They are a popular annual flower that brings vibrant colour to a range of settings. You can use Lobelia plants in containers, hanging baskets, or as edging along your flower garden, which offers versatility in your landscaping. With a love for blooming all summer long, these plants ensure your garden stays lively throughout the season.

The Russian Giant Sunflower Seeds by Thompson and Morgan are an excellent choice for those who want to attract pollinators to their gardens. These hardy annuals produce huge butter-yellow flowers atop strong stems that can reach up to 10ft tall during summer. They are simple and easy to grow, making them perfect for gardeners of all skill levels. With 25 seeds in a packet, you can create a stunning display that not only enhances your garden's beauty but also supports local wildlife.

Transform your garden with the Wild Pansy Seeds from Thompson & Morgan. These seeds offer a delightful mix of colours, making your hanging baskets and patio containers vibrant and eye-catching. You will appreciate their versatility, as they bloom beautifully from summer through to winter. Ideal for adding a splash of colour to your flower beds, these hardy annuals are easy to grow, ensuring that you can enjoy stunning flowers with minimal effort. Perfect for both novice and experienced gardeners alike.

Mr Fothergill's Marigold Seeds are a fantastic choice for gardeners looking to add vibrant colour to their outdoor spaces. These half hardy annuals bloom in the same year they are sown, ensuring you can enjoy flowers all summer long. They thrive in various weather conditions, making them easy to grow regardless of the season. You can create stunning bedding, border, and patio displays that not only beautify your garden but also attract beneficial bees and butterflies.

The Cosmos 'Royal Dwarf' offers a delightful pack of 200 seeds that produce feathery green leaves and abundant large white flowers from June to October. Growing to a compact height of about 50cm, these flowers are perfect for containers, borders, and as stunning cut flowers in your home. Being a half-hardy annual, they are easy to grow, allowing you to start sowing indoors from March or directly in the ground from May. This makes them an excellent choice for any gardener, regardless of experience.

The Welldales Strawflower Seeds offer a vibrant mix of colourful blooms, perfect for creating stunning dried arrangements. These drought-tolerant plants are low maintenance and easy to grow, making them suitable for both containers and borders in your garden. You will appreciate their unique, papery texture, which adds charm to floral crafts and wreaths. Furthermore, these delightful flowers attract butterflies and other pollinators, enhancing your garden's ecosystem while providing beauty from summer to fall.

The Welldales Angel Wings Seeds offer an easy way to grow stunning flowers that can brighten any space. Once grown, these compact plants make excellent potted additions to your home or garden. You will enjoy beautiful blooms in various pastel tones, reminiscent of orchids, and including shades of pink, purple, red, and violet. These seeds are straightforward to sow, whether indoors or outdoors, and they grow quickly, allowing you to enjoy your flowers in no time.

The Viola Cornuta Flower Seeds from Premier Seeds Direct are perfect for adding vibrant colour to your garden. For the earliest blooms, you can sow the seeds indoors 6 to 8 weeks before the last frost, ensuring they are covered with a fine layer of soil. Germination occurs in 10 to 20 days, requiring darkness for success. Keeping the soil moderately moist during this period is essential for healthy growth. For later flowers, you can directly sow them outdoors in mid-spring after the frost risk has passed, offering flexibility in planting times.