August Flowers: The Best Blooms in Season in the UK

August is a very good month for flowers. The gardens are overflowing, summer is still in full swing, and some of the year's most spectacular blooms are having their moment. Dahlias are getting bigger, hydrangeas are looking gloriously full, roses are still going strong, and sunflowers are doing what sunflowers do best — bringing the sunshine.

If you're wondering what flowers are in season in August in the UK, you're spoilt for choice.

From romantic dahlias to delicate cosmos, here are some of our favourite August flowers and why this late-summer month is such a wonderful time for flowers.

Dahlias: August's ultimate show-offs

If August had a signature flower, we'd probably give the crown to the dahlia. There are pom-poms, cactus dahlias, dinner-plate varieties and beautifully ruffled blooms, all in an almost ridiculous range of colours. Blush, peach, raspberry, burgundy, cream, coral — you name it.

Dahlias are particularly beautiful in late-summer bouquets, where their generous shapes create that wonderfully abundant florist look. Pair them with garden roses and hydrangeas for something romantic, or add more unusual textures and foliage for a bouquet with a little more attitude. August is definitely not the time to be shy with dahlias.

Hydrangeas: big, beautiful and impossible to ignore

Hydrangeas are another August favourite. Their large, cloud-like flower heads instantly make an arrangement feel abundant, whether you're using a few stems or going all-out.

August hydrangeas can be found in beautiful shades of blue, lavender, lilac, blush, white and green. As summer progresses, some varieties also begin taking on those gorgeous antique tones that florists love.

They're incredibly versatile, too. White and green can feel elegant and minimal, while blue and lavender create something cooler and more romantic. And when combined with dahlias? Very hard to resist.

Roses are still having their moment

Roses don't disappear when August arrives — thankfully.

Summer roses bring a softer, more relaxed feeling to bouquets, particularly in shades of peach, apricot, blush and cream. Garden roses are especially beautiful when available, with their ruffled petals and slightly old-fashioned charm. Combine them with dahlias, hydrangeas and seasonal foliage and you've got the perfect late-summer garden bouquet.

And no, you don't need a birthday or anniversary as an excuse to send one.

We don't make the rules.

Sunflowers: bring your own sunshine

There is something wonderfully unapologetic about a sunflower. They're big, bright and absolutely not interested in blending into the background.

August is one of the best months for these cheerful blooms. Classic golden yellow varieties are always popular, but deeper shades can also create surprisingly sophisticated arrangements. Try pairing sunflowers with blue or purple flowers for contrast, or with peach, coral and warm pinks for a softer summer palette.

They're particularly lovely for August birthday flowers when you want something cheerful and full of personality.

Cosmos and zinnias: the playful ones

Not every August flower needs to be dramatic.

Cosmos bring something completely different to a bouquet. Their delicate petals and slender stems create movement and that slightly wild, just-picked-from-the-garden feeling. Zinnias, meanwhile, are colourful, cheerful and wonderfully underrated. They come in vibrant shades that work beautifully with dahlias, roses and other late-summer flowers.

These are the flowers that can make an arrangement feel less predictable — and we're always here for that.

Don't forget the flowers that add personality

Some of the best flowers in season in August aren't necessarily the ones that grab your attention first. Scabiosa, amaranthus, sea holly and other textural flowers can completely change the character of a bouquet. Scabiosa adds delicate, almost pin-like flowers, while amaranthus can trail beautifully through an arrangement. Sea holly brings an unusual silvery-blue texture.

They might not be the stars, but they're often what makes a bouquet interesting. A good florist isn't simply choosing the prettiest flowers. It's about combining different shapes, textures, heights and colours so the whole arrangement feels considered.

The best August flowers for weddings

August is a popular month for weddings, and luckily it also offers an incredible selection of seasonal wedding flowers.

For a romantic August wedding bouquet, dahlias, garden roses, hydrangeas and cosmos make a beautiful combination.

For something more colourful, try dahlias with zinnias, roses and summer foliage. And if you prefer something elegant and understated, white hydrangeas, roses and delicate blue flowers create a fresh late-summer palette.

One of the biggest advantages of choosing seasonal wedding flowers is that your florist can work with what's naturally looking its best at the time. Rather than forcing a particular flower into your wedding design, you can let the season inspire the colour palette, textures and overall feeling. And that's when wedding flowers become much more interesting.

What colours work best with August flowers?

August doesn't have to mean bright yellow and orange.

Some of our favourite late-summer combinations are much softer: blush and peach, blue and white, lavender and cream, or raspberry and burgundy. For something warmer, terracotta, peach and dusty pink feel wonderfully August-like without being overly summery.

The best part is that seasonal flowers naturally give you plenty of inspiration. You don't always need to start with a strict colour scheme — sometimes it's better to see what's looking beautiful and build from there.

Why we love August flowers

August flowers have personality. They're generous, colourful and a little bit wild. There are enormous dahlias, fluffy hydrangeas, romantic roses, cheerful sunflowers and all the delicate little flowers that make a bouquet feel unexpectedly beautiful.

It's also one of those lovely moments between seasons. Summer isn't quite finished, but you can already sense autumn waiting around the corner. For now, though, we're happy to let the flowers have their moment.

Looking for August flowers in London?

At Orchidya, we love working with flowers that are looking their best right now. Whether you're sending August birthday flowers, celebrating a special occasion or simply deciding that someone deserves flowers for no particular reason at all, late summer gives us plenty to play with. Explore our seasonal bouquets and discover what's blooming with Orchidya London.