A reliable selection of perennial flowers that bloom all summer can help your garden look its best for as long as possible. A variety of summer plants provide flowers from June to September and even beyond, in the UK, offering long-lasting colour as well as food for pollinators such as bees.


Long-flowering summer plants may need deadheading to keep blooming, while a weekly application of tomato fertiliser can promote new flowers to grow.

Browse our pick of the the best summer flowers to grow:

Hardy geraniums

Plants you can't kill - Geranium 'Rozanne'

These easy-to-grow perennials will provide beautiful, pollinator-friendly blooms throughout summer and into autumn. There's an array of hardy geranium to grow, and many will grow happily in shade or sun – find out more about how to grow hardy geraniums.


Erigeron karvinskianus

Erigeron karvinskianus is a spreading, perennial daisy with an informal growth habit, ideal for planting in the crevices of walls, steps and paving stones. It'll often flower well into autumn, too. Good for a well-drained spot in full sun or partial shade.

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Abutilon megapotamicum

If you can provide them with some form of winter protection from frosts, abutilons will prove their worth with year-round flowers. Give them a sunny position, with plenty of water and feeding to get the best from them. Pictured is the trailing abutilon, Abutilon megapotamicum.


Campanula poscharskyana

For flowers all summer, try the creeping campanulas like Campanula portenschlagiana and Campanula poscharskyana. Like Erigeron karvinskianus, they're ideal for growing in cracks and crevices. The flowers are popular with pollinators.

Explore our latest summer colour plant offers

The summer season is when many of us spend the most time in our gardens, enjoying al fresco dining on long, warm summer nights. Tropical planting comes into its own, fragrant roses burst into bloom, and there's no shortage of vibrant perennials that flower all summer long to choose from.

Explore our latest summer colour plant offers

Iberis sempervirens

Iberis 'Masterpiece'

Commonly known as candytuft, this perennial, low-growing plant is a brilliant ground cover choice for the front of borders or in containers. It'll provide clouds of frothy blooms from spring to autumn.


Potentilla x hopwoodiana

Potentillas are compact shrubs and herbaceous perennials, well-suited to growing as floral hedges or growing in well-drained herbaceous borders. Potentillas respond well to deadheading, which will provide you with the best display. Pictured is the beautiful hybrid Potentilla x hopwoodiana.

Sweet peas

Sweet Pea 'Heirloom Stripe'

These popular annuals can begin flowering as early as May. When deadheaded, or if the flowers are snipped just before opening for cut sweet peas, you'll easily have flowers throughout summer and into autumn. Follow the growing advice in our sweet pea grow guide.

Perennial wallflowers

Erysimum 'Bowles's Mauve'

Perennial wallflowers like 'Bowles's Mauve' and 'Apricot Delight' not only provide summer flowers, but have even been known to flower all year. Just make sure you deadhead spent flower spikes to encourage plants to produce more.

  • Buy 'Bowles's Mauve' from Crocus
  • Buy 'Apricot Delight' from Dobbies


More plants for flowers all summer

  • Fremontodendron
  • Verbena bonariensis
  • Geranium 'Rozanne'
  • Salvia microphylla
  • Coreopsis
  • Penstemons
  • Nepeta x faassenii


This article was last updated in April 2022. We apologise if anything has changed in price or availability.