Blue is the rarest colour in the garden. It drifts between violet and sky, deepens at dusk, and mingles beautifully with every neighbouring bloom in the familiar colours of summer.

And there is something particularly lovely about blue flowers in a cottage garden. Their soft, often dreamy shades bring a sense of calm to the garden. From delicate little blooms scattered along a garden path to tall, graceful flower spires rising above the borders, blue flowers have a way of making a garden feel both romantic and wonderfully old-fashioned.

A garden filled with blue flowers needn't be made up of just one shade. Pale sky blues, soft powder blues and deeper shades of indigo can all find a place together, creating a beautiful tapestry of colour and texture. And if you would like a gentle guide to choosing and placing them, join the Blue Flower guide waitlist.

1. Delphinium

Delphiniums are a classic favourite in English cottage gardens. Their tall, elegant spires rise above the garden, carrying layers of delicate flowers in beautiful shades of blue, from soft powder blue to rich, deep indigo. Planted in generous groups, their towering blooms create a dreamy backdrop, like something from an old-fashioned storybook illustration.

Good to know: Delphinium and Larkspur are frequently confused, as their names are often used for one another. They are actually different plants, but they do belong to the same flower family. Delphiniums are perennials that return each spring, while Larkspur is an annual that self-seeds and come back year after year as if they were perennials.

2. Bellflower (Campanula)

With their charming bell-shaped flowers, campanulas bring a little softness and whimsy to the cottage garden. Their blooms appear in shades of blue, violet and lavender, with some varieties offering particularly lovely clear blue flowers.

They are forgiving, cheerful and generous, spreading gently from year to year. The smaller varieties are perfect for the edges of a path, a stone wall, or a container. While taller varieties add height and a gentle, old fashioned charm. Their delicate little bells have a rather enchanting quality, especially when allowed to mingle with other garden flowers. Plant them in sun or light shade, and let them soften every edge of the garden.

Many varieties are easygoing perennials, returning year after year and gradually filling their little corner of the garden. Whether spilling along a garden edge or tucked between taller plants, bellflowers have a gentle unassuming beauty that makes them feel right at home in a traditional cottage garden.

3. Starflower (Borage)

Look closely at a borage bloom and you will find a perfect little star of vivid blue, with dark centres and delicate, fuzzy stems. It brings to mind a garden where flowers are allowed to mingle freely, attracting many pollinators and finding their own spaces among the greenery. Its cheerful blue blooms are also edible, making it a particularly charming flower to grow near a kitchen garden.

Borage is a cheerful self-seeder, so once you introduce it to your garden, it tends to stay, popping up in unexpected places each year. Think of it as a garden gift that keeps on giving, bringing a fresh scattering of blue flowers wherever it finds a home. Of course, if you prefer to keep it contained, simply remove the spent flowers before they drop their seeds.

4. Hydrangea

Few flowers bring blue quite the same feeling of abundance as a hydrangea in full bloom. I fell in love with them when I saw them in bloom beneath the windows of a little cottage home in a lakeside village near where I live. Imagine a generous shrub covered in blue blooms beside an old garden gate, or nestled among the greenery of your own garden.

Their generous flower heads create beautiful rounded clusters of colour. From soft, misty blue to more vivid shades, hydrangeas bring a sense of romance and fullness to the garden. In certain varieties, particularly 'bigleaf hydrangeas', acidic soil and aluminum can encourage those beautiful blooms to lean toward true blue.

Choose a spot with morning sun and afternoon shade, water well, and enjoy a shrub that anchors a garden for years. With their generous flowers and lovely presence, hydrangeas have a timeless quality that makes the garden feel established, welcoming and full of summer charm.

5. Forget-Me-Not

There is a particular sweetness to forget-me-nots. Their tiny, five-petaled flowers, with delicate blue petals and sunny yellow centres, create a beautiful little display that feels almost like something from an old-fashioned garden painting. I've had a little cluster appear between the branches of my Weeping Nootka Cypress, and I fell in love with the tiny flowers.

Rather than standing tall or demanding attention, forget-me-nots bring their beauty in little drifts of colour. They look lovely tucked between larger flowers, scattered along garden paths or growing beneath shrubs. Their soft blue blooms create those unexpected little moments of beauty that make wandering through a cottage garden so enjoyable.

A Garden Filled with Shades of Blue

One of the loveliest things about creating a blue flower garden is discovering how beautifully different flowers can complement one another. Tall delphiniums bring height and drama, delicate campanulas soften the garden, and little forget-me-nots add those charming touches of colour beneath the larger blooms.

Together, they create a garden that feels romantic, relaxed and full of old-fashioned summer beauty. And with so many lovely shades of blue to choose from, there are endless possibilities for bringing this colour into your own garden.

Planning your Blue Garden in Winter

The quiet months are the best time to dream and draw, especially when thoughts of next summer's garden begin to take shape. Sketch your flower borders, imagine where the taller stems will stand, and let the shorter blooms spill along the front. Mix in white flowers for a calm, luminous effect, or pair blue with soft pink and cream for a classic cottage garden.

A little planning now can help bring those lovely ideas together when the gardening season returns.

When you are ready to start planning, my Garden Planning Guide for Blue Flowers is on its way. Join the waitlist and be the first to know when it arrives.