Summer autumn flowering hardy perennial autumn aster (Symphyotrichum syn. Aster) in flower bloom

Six summer perennials for August

We recommend six late-summer perennials to grow for dazzling August displays.

Ensure summer goes out with a bang by filling your garden with stunning, August-flowering perennials.

Of course, the display doesn't need to end on the last day of August – help extend the flowering of many plants by deadheading frequently. Don't forget to include foliage plants, such as ornamental grasses, to boost the movement and texture in your plot.

Discover six summer perennials for August to grow, below. 

Advertisement

Dahlias

Dahlias really are at their peak in late summer and autumn. Pictured is a semi-cactus dahlia, Dahlia 'Rev P. Holian' – discover more cactus and semi-cactus dahlias to grow. Don't forget to grow beautiful single-flowered dahlias, so pollinators can access the pollen and nectar.

Astrantias

These lovely perennials are a doddle to grow. Moist, partial shade is best, and you'll be rewarded with charming, starry blooms. Take a look at 10 varieties of astrantia to grow

Kniphofias

Red-hot pokers (Kniphofia) are perfect for turning up the heat in containers, beds and borders. 'Ice Queen' has white-hot blooms, while those of 'Nancy's Red' are a more mellow red-orange. Grow in full sun, in moist, well-drained soil.

Salvias

Wildlife-friendly, beautiful blooms and attractive foliage – it's hard to beat salvias. Here are 16 spectacular salvias you could grow. Deadhead to keep the flowers coming.

Japanese anemones

Japanese anemones are dependable, summer perennials for August that can be grown in full sun or partial shade. Most cultivars should be coming into flower in August. Simply mulch in spring and avoid transplanting, as they dislike this. 

Asters

This includes the many species that were formerly placed in the genus Aster, but are now grouped differently, including Eurybia macrophyllus and Symphyotrichum 'Little Carlow'. Cut back hard after flowering.
Red-hot pokers (Kniphofia) are perfect for turning up the heat in containers, beds and borders.

Advertisement

Discover more ideas and inspiration

Related content

Alan's plants for August colour

Plant combinations for full sun

Five summer perennials for June

Related offers

Offer

Save £17 on hellebores

Enjoy reliable spring colour year after year with these gorgeous hellebores. Buy five plants for £11.99, or save over £17 when you buy the saver collection, including 10 of each, for just £29.99.

Order now

Offer

Daphne and camellia

Fill your spring garden with early colour and scent with a beautiful Daphne mezereum and Camellia 'Fairy Blush'. Buy either individually, or save £11 on the collection.

Order now

Offer

Japanese anemones

Save over £13 on a collection of Japanese anemones at Thompson & Morgan. You'll get 10 plants (two of each variety) for under £30 with this offer.

Order now