The Last Flowers of Summer: Plants That Keep the Garden Glowing

By late August, the garden begins to change.

The fresh greens and exuberant growth of early summer start to soften, grasses take on warmer tones and seed heads begin to appear. But this certainly doesn't mean the end of colour in the garden.

In fact, some of the most valuable plants in a well-designed garden are only just reaching their best.

Late-flowering perennials such as Rudbeckia, Helenium, Echinacea and Japanese anemones can carry a planting scheme from the final days of summer well into autumn. Combined with ornamental grasses, they create gardens that feel richer and more atmospheric as the season changes.

Rudbeckia – the late-summer star

Few plants signal late summer quite like Rudbeckia.

Its golden-yellow flowers and dark central cones bring warmth to borders at precisely the point when many earlier perennials are beginning to fade.

One of the best-known varieties is Rudbeckia fulgida 'Goldsturm', which produces masses of strong yellow flowers from late summer into autumn.

Rudbeckias work particularly well when planted in generous groups rather than as isolated specimens. Their simple flower shape repeats beautifully through a border and provides the rhythm that makes a naturalistic planting scheme feel intentional rather than random.

They are also extremely effective alongside ornamental grasses, where the strong flower heads contrast with softer, more fluid foliage.

Helenium – warm autumn colour

If Rudbeckias provide the yellows, Heleniums introduce the oranges, reds and burnt copper tones that begin to hint at autumn.

Their daisy-like flowers are particularly useful for creating planting schemes with a warmer palette.

Planted alongside grasses, Rudbeckias and later-flowering perennials, Heleniums can create a wonderfully rich transition between summer and autumn.

Rather than fighting the changing season, these colours embrace it.

Echinacea – beauty beyond the flower

Echinacea is another excellent late-summer perennial, with its distinctive raised central cone surrounded by petals in shades of pink, purple and white.

But one of the reasons we particularly value Echinacea is what happens after flowering.

As the petals disappear, the architectural seed heads remain.

This is an important consideration when designing planting schemes. A plant shouldn't necessarily be judged purely by how it looks at peak flowering. Its foliage, structure, seed heads and winter silhouette can all contribute to the garden.

Leaving Echinacea seed heads standing can also provide food for birds while giving the border valuable structure through autumn and winter.

Japanese anemones – elegance in the shade

For slightly shadier areas, Japanese anemones are invaluable.

Their tall stems carry delicate pink or white flowers above attractive foliage, often continuing well into September and October.

They are particularly effective towards the middle or back of a border, where the flowers appear to float above neighbouring plants.

Their lighter colours can also provide an excellent counterpoint to the stronger yellows and oranges of Rudbeckias and Heleniums.

Don't forget the grasses

Late summer is also when many ornamental grasses begin to earn their place in the garden.

Miscanthus, Calamagrostis, Molinia, Pennisetum and Deschampsia can all bring movement and texture to a planting scheme.

As the light becomes lower towards the end of summer, grasses can look spectacular when illuminated from behind. Their flower heads catch the sunlight and introduce movement whenever there is the slightest breeze.

Combining grasses with late-flowering perennials creates something particularly valuable: a garden that doesn't suddenly stop when summer does.

The importance of repetition

One of the secrets to successful late-summer planting is restraint.

It can be tempting to choose dozens of different plants, but stronger planting schemes often use a relatively limited palette and repeat those plants throughout the garden.

A drift of Rudbeckias appearing several times through a border will generally have much greater visual impact than a single plant surrounded by unrelated varieties.

Repeating grasses and structural plants alongside them ties the whole scheme together.

The result feels natural, but importantly, it still feels designed.

Don't be too quick to tidy

As summer fades, there is often an instinct to start cutting everything back.

We prefer to be selective.

Many late-flowering plants continue to contribute to the garden long after their flowers have disappeared. Seed heads from Rudbeckias, Echinacea and grasses can look wonderful covered in autumn dew or winter frost.

They also provide habitat and food for wildlife.

Sometimes the best thing you can do for a garden in autumn is simply leave it alone for a little longer.

Designing for more than summer

A garden shouldn't peak for a few weeks in June and then gradually disappear.

When we design planting schemes at Kirman Design, we think about how the garden will evolve throughout the year.

Spring bulbs emerge before the main planting develops. Early summer perennials provide the first major display. Late-summer plants such as Rudbeckias and Echinacea then take over, before grasses, seed heads and structural planting carry the garden into winter.

It is this succession that creates a garden worth looking at throughout the seasons.

And there is something particularly special about the final flowers of summer.

Perhaps it is because we know their display won't last forever.

The light is softer, the colours are warmer and autumn is beginning to make itself known.

Summer may be coming to an end, but a beautifully designed garden still has plenty left to say.