Lilac aster flowers

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.

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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.

Red-hot pokers (Kniphofia) are perfect for turning up the heat in containers, beds and borders.

1

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.

Crimson blooms of Dahlia 'Rev P. Holian'
Crimson blooms of Dahlia ‘Rev P. Holian’
2

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.

White astrantia flowers edged with deep pink
White astrantia flowers edged with deep pink
3

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.

Yellow red hot pokers
Yellow red hot pokers
4

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.

Deep pink flowers of Salvia involucrata
Deep pink flowers of Salvia involucrata
5

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.

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A mid-pink Japanese anemone bloom
A mid-pink Japanese anemone bloom
6

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.

Lilac aster flowers
Lilac aster flowers