Discover our selection of 25 decorative blue flowers to plant outdoors, to illuminate your flowerbeds, flowerbeds and path borders.
Vary the heights and shapes to give character to your compositions.
1. Clematis (
Clematis
)
Clematis offers colorful flowers in the full range of blues and fragrant, from April to October.
Copyright (c) 2021 Tony Baggett/Shutterstock.
No use without permission.
Considered one of the most beautiful twining climbing plants, clematis offers colorful flowers in
the full range of blues
and fragrant, from April to October, which attract butterflies and bees.
Rustic, the one often called the “Queen of creepers”, thrives in most regions of France.
2. Agapanthus (
Agapanthus
)
Agapanthus is a perennial with rhizomes which brings volume and height to a flowerbed.
Copyright (c) 2022 IvaD23/Shutterstock.
No use without permission.
Originally from South Africa, agapanthus is a perennial with rhizomes which brings
volume and height
to a flowerbed.
It is recognizable by its tuft of long leaves, its long stems and its globular umbels 15 to 20 cm in diameter, formed by numerous
trumpet-shaped mauve-blue flowers
which bloom in summer.
New varieties exist, more resistant to cold.
3. Delphinium or “Larkspur” (
Delphinium
)
The larkspur's large flower spikes bloom from June to October.
Copyright (c) 2022 Fabrizio Guarisco/Shutterstock.
The large spikes of larkspur flowers, which bloom from June to October, often exceed a meter in height.
These perennial flowers
Structuring plants are generally planted at the bottom of a flowerbed or at the edge of a path.
Bringing together nearly 400 species, Delphinium offers a wide variety of blue colors including sky blue, cyan blue and even lavender blue.
4. Meadow sage (
Salvia pratensis
)
Meadow sage is a herbaceous perennial plant growing in clumps.
Copyright (c) 2016 guentermanaus/Shutterstock.
Meadow sage is a fragrant perennial plant which offers aerial flowering spikes of a
beautiful purplish blue
in summer (June to August).
Very hardy (up to -34°C),
Salvia pratensis
adapts easily to its environment and tolerates poor soils and exposure to wind.
It is also very honey and nectar-producing.
Also read9 perennial blue sages perfect for creating an azure garden
5. Siberian iris (
Iris sibirica
)
The Siberian iris is absolutely beautiful with its blue flowers streaked with yellow and white.
Copyright (c) 2023 Flower_Garden/Shutterstock.
No use without permission.
A perennial bulb plant, the Siberian iris is absolutely beautiful with its
blue flowers streaked with yellow and white
which appear in May and June.
It measures between 30 and 90 cm.
Very easy to grow, resistant and hardy (up to -29°C), the Siberian iris has no shortage of advantages and fits perfectly into a romantic garden or a refined outdoor space.
6. The Caucasian forget-me-not (
Brunnera macrophylla
)
The Caucasian forget-me-not can be recognized by its small flowers, which measure less than a centimeter in diameter.
Copyright (c) 2022 Fox Traveler/Shutterstock.
No use without permission.
Often planted by those looking for a dense, poetic ground cover
In semi-shaded areas of a garden, the Caucasian forget-me-not can be recognized by its small flowers, which measure less than a centimeter in diameter.
The latter are composed of
light, intense blue petals
and heart-shaped deciduous hairy leaves.
This herbaceous perennial blooms in spring and sometimes returns in autumn.
7. Periwinkle (
Vinca
)
Periwinkle has the advantage of not losing its leaves in winter!
Copyright (c) 2021 Orest lyzhechka/Shutterstock.
No use without permission.
If you are looking for a very hardy plant, which will form a charming ground cover, periwinkle will not disappoint you.
This perennial herb has the advantage of not losing its leaves in winter (unlike the Caucasian forget-me-not above).
Its pretty
blue flowers tending towards mauve
, which appear from March to June, are a beautiful source of light in shaded and neglected areas of a garden.
8. Ceanothus (
Ceanothus
)
Ceanothus, or California lilac, is an evergreen shrub.
Copyright (c) Sopf/Shutterstock.
Copyright (c) 2020 sopf/Shutterstock.
No use without permission.
The clusters of fragrant flowers of the ceanothus are reminiscent of those of the lilac (it is also nicknamed California lilac).
A magnificent
bright blue in spring or summer
depending on the variety, this hardy shrub, which grows quickly, is
very ornamental
in a garden.
It also exists in creeping form like Ceanothus prostratus which measures approximately 50 cm in height and represents an excellent ground cover.
9. The knapweed (
Centaurea
)
The knapweed, which we also know under the name “cornflower”, is a lovely country flower which exists in particular in blue and purple.
Copyright (c) 2021 simona pavan/Shutterstock.
No use without permission.
The knapweed, which we also know under the name “
cornflower
”, is a lovely country flower which exists in particular in
blue and purple
.
In beds or on the border, it brings charm to the garden and attracts butterflies.
An easy plant, which does not require any special maintenance, the centaury is also hardy and vigorous.
The best part: its flowers are edible and can decorate your shortbread or salads.
10. Hydrangea (
Hydrangea macrophylla
)
Hardy, down to -30°C, Hydrangea macrophylla is also easy to maintain.
Copyright (c) 2020 gdela/Shutterstock.
No use without permission.
As an isolated shrub or in a clump, the hydrangea flowers from June to September.
Hardy, up to -30°C,
Hydrangea macrophylla
is also easy to maintain.
Among the beautiful varieties are the blue flowers with white edges of 'Beautensia Dali' and the light blue flowers of 'Blue wave'.
It is possible to “blue” certain pink or mauve varieties at the base!
The secret: water with an alumina sulfate solution during the vegetation period or mulch with crushed slate!
11. Shrub speedwell (
Hebe spp.
)
Veronica is a perennial whose bright blue flowers in spikes easily catch the eye.
Copyright (c) 2021 lennykaiser/Shutterstock.
No use without permission.
Very melliferous, the veronica is a perennial whose bright blue flowers in spikes
easily catch the eye.
The one also called “hebe”, offers its beautiful blue-purple colors generously, in spring or summer
for at least two months
(and perhaps even in autumn).
If you live along the Atlantic coast, your speedwell will be in heaven, enveloped in softness and humidity.
The Hebe x andersonii variety blooms superbly in the form of a dense, tall clump (2 m), which flowers from July to October.
12. The Cape plumbago (
Plumbago capensis
)
The plumbago is a semi-shrub, semi-climbing frost-resistant plant native to South Africa, appreciated for its long azure blue flowering.
Copyright (c) 2018 Wagner Campelo/Shutterstock.
No use without permission.
The plumbago is a semi-shrub, semi-climbing frost-resistant plant native to South Africa, appreciated for its
long azure blue flowering
, from July until the first frost.
Its stems are not very voluble, but easily attach to a structure such as a pergola or a fence to dress it naturally.
13. Bluebird hibiscus syriacus (
Hibiscus syriacus
)
The althea or hibiscus syriacus Bluebird is also called “tree mallow”.
Copyright (c) 2023 Alex Manders/Shutterstock.
No use without permission.
Very appreciated for its exotic flowering in summer
perfectly highlighted when planted as an isolated subject, the althea or hibiscus syriacus Oiseau bleu is also called “tree mauve”.
This beautiful rustic shrub, 2 to 3 m high, offers large, exceptional pale blue flowers with a purple center that can accompany you until autumn if the late season is mild.
14. Perennial Geranium (
Geranium
)
Unlike the florists' geranium, the perennial geranium is a robust plant, which spends the winter in the garden without any difficulty.
Copyright (c) 2018 F.Neidl/Shutterstock.
The perennial geranium is well known for its simplicity of cultivation and its flowering advantages.
Among the varieties which offer beautiful blue flowers are the perennial geranium 'Sabani Blue', superb as a ground cover, which flowers from May for a good two months or the Geranium 'Johnson's Blue' which presents pretty flowers. a light purple blue, with a white heart.
15. Lobelia (
Lobelia urens
)
Lobelia is an annual or perennial plant depending on the species, which flowers from August to September.
Copyright (c) 2018 Nadezda Nikitina/Shutterstock.
No use without permission.
For the cascades of
small light blue flowers
with white hearts, it is the lobelia, known for its drooping habit, that you should choose.
This annual or perennial plant depending on the species, which flowers from August to September, is an ornamental but also medicinal plant.
16. Blue Persian bellflower (
Campanula persicifolia
)
The blue Persian bellflower flowers from June to September.
Copyright (c) 2020 ANGHI/Shutterstock.
No use without permission.
The blue Persian bellflower blooms from June to September: multiple flowers in delicate
blue or purple bells
then appear, which can measure up to 80 cm.
If you want semi-shaded rock gardens to bloom, this is the blue flower you need!
17. Perennial flax (
Linum perenne
)
Blue flax flowers from May to June (hot, dry climate) or from July to September.
Copyright (c) 2019 Olga_Golub/Shutterstock.
No use without permission.
A hardy perennial plant that always fits nicely into flower beds, blue flax flowers from May to June (hot, dry climate) or from July to September.
Its satin flowers, a bright
sky blue veined with dark blue
, bring a rural touch
in compositions that lack lightness.
18. Blue-flowered lavender (
Lavandula angustifolia Munstead
)
Faced with scorching summers and harsh winters, it has become crucial to choose plants that are resistant to cold and heat
Blue-flowered lavender is an ornamental variety which forms a small, very rounded bush, 50 cm in all directions.
It adapts to most soils and withstands the highest heat.
Its
mauve-blue flowers in spikes
, very fragrant, appear from June to August depending on the region.
They are particularly nectar- and honey-producing, ideal for beautifully dressing your rock gardens!
19. Blue hyacinth (
Hyacinthus orientalis
)
Hyacinth is an annual plant that flowers in spring.
Copyright (c) 2017 Gardens by Design/Shutterstock.
No use without permission.
Hyacinth is an annual plant that flowers in spring.
Its pretty clustered flowers display their
blue-purple bells
from the beginning of spring when they are planted in a garden, in a sunny bed.
Their powerful scent never goes unnoticed.
20. Armenian muscari (
Muscari armeniacum
)
Armenian muscari is ideal for forming a thick carpet of multiple bright blue flowers.
Copyright (c) 2022 Flower_Garden/Shutterstock.
No use without permission.
A particularly floriferous bulbous plant, Armenian muscari is ideal for forming a
thick carpet of multiple bright blue flowers
, which will bloom in April and May.
This hardy plant, which also tolerates drought, will be equally at home at the foot of trees, at the edge of a path or in a rock garden.
21. Comfrey (
Symphytum officinale
)
Comfrey is an herbaceous plant that produces pretty little blue bells in early spring.
Copyright (c) 2020 FunFamilyRu/Shutterstock.
No use without permission.
Comfrey is an herbaceous plant that produces
pretty little blue bells in early spring
.
You can also use it to make your comfrey manure!
Its richness in potassium, minerals, calcium and phosphorus helps boost crops.
22. Aconite, (
Aconitum sp
)
Aconite is a very ornamental plant which allows you to create magnificent flower beds in blue or purple.
Copyright (c) 2016 LianeM/Shutterstock.
No use without permission.
Aconite, also called Jupiter's Helmet, is a very ornamental plant which allows you to create magnificent
flower beds of blue or purple
between the months of May and October.
But it contains aconitine, a very toxic alkaloid.
Only 2 to 4 g of aconite roots can then cause death.
The important thing is to know it.
23. The Echinops ritro (
Echinops ritro)
Related to thistles, echinops or azure balls flower from June to September.
Copyright (c) 2019 weha/Shutterstock.
No use without permission.
Related to thistles, echinops or azure balls flower from June to September, offering the garden their
beautiful electric blue pompoms
.
Perfect for beginner gardeners, it requires no maintenance.
Best in mineral compositions or seaside gardens, echinops measures up to 1m20.
24. Blue Star Columbine (
Aquilegia x hybrida Blue Star
)
Columbine is a very hardy herbaceous perennial that flowers from April to June.
Copyright (c) 2023 Elmar Langle/Shutterstock.
No use without permission.
Among the varieties of columbine, the Blue Star columbine, recognizable by its lavender blue
crown
, deserves to be known.
This very hardy herbaceous perennial flowers from April to June.
They reseed easily in the garden.
25. Damascus nigella,
(Nigella damascena)
Damask Nigella is a very decorative annual flower!
Copyright (c) 2022 LutsenkoLarissa/Shutterstock.
No use without permission.
This very decorative annual, which brings lightness to flower beds, displays quite ephemerally (between May and July),
star-shaped flowers of a beautiful electric blue
and a pretty collar of leaves.
But if you schedule several sowings during the spring, you will be able to enjoy your nigellas for longer!