Blue Flowering Perennials (15 Easy To Grow Plants)

If you’re looking to add a pop of color to your garden, consider adding some blue flowering perennials. Blues are stunning with other colors in the garden or in monochromatic drifts. There are a number of different plants with blue flowers that are also low maintenance, so you’re sure to find at least one that’s perfect for your garden.

Every year, I get the gardeners “bug”…the desire to buy new plants even though I have no space in the garden to put anything (and not much time to do any planting).

Since I have never been able to talk myself out of buying new plants, the least I can do is get ones that are low maintenance and that I love!

With that in mind (and since blue is my favorite color), I created a list of low maintenance perennials with beautiful blue flowers. And thought I’d share since you might like these, too.

Keep reading to find out what my favorite easy-to-grow blue flowering perennials are.

1 | Globe Thistle (Echinops)

Zone: 3 to 9
Exposure: Full sun
Height: 2′ to 4′
Width: 2′
Bloom time: Summer to fall
Flower color: Bright blue

Globe thistles are a very drought-resistant perennial that produces spherical stunning blue flowers in the mid to late summer.

They provide some color to the late summer garden, attract butterflies and are also great for using in dried flower arrangements…a very versatile plant!

Buy them here.*

2 | Catmint (Nepeta x faassenii)

Zone: 3 to 9
Exposure: Full sun
Height: 1′ to 2′
Width: 2′ to 3′
Bloom time: Spring to summer
Flower color: Purple blue

Catmint is a perennial herb that produces purple blue blooms above bluish-green leaves and blooms for quite a long time.

As an added bonus, it is drought tolerant and deer resistant…one tough plant!

3 | Dutch Iris

Zone: 3 to 9
Exposure: Part sun to full sun
Height: 20″ to 24″
Width: 6″
Bloom time: Late spring
Flower color: Blue with yellow

These beautiful blue irises have yellow throats which make the blue stand out even more.

They grow from bulbs that you can plant in the fall, and make a beautiful display in the late spring.

The leaves die back after the plant has finished blooming, so it helps to plant them with later-blooming companion plants that will fill in the space.

Also (as with other spring blooming bulbs), don’t cut the leaves off until they have turned brown…they are strengthening the bulbs for next year’s blooms!

4 | Iris reticulata

Zone: 5 to 8
Exposure: Full sun
Height: 6″ to 8″
Width: 6″ to 8″
Bloom time: Early spring
Flower color: Blue with yellow and white

Iris reticulata is another spring-flowering bulb that is planted in the fall and has blue petals with similar colors to the Dutch Iris above.

This plant is quite short and is one of the first to bloom in early spring. Always a welcome site when winter is finally over!

I like to combine it with Phlox subulata since the Phlox will hide the dying bulb leaves.

5 | Moss or creeping Phlox (Phlox subulata)

Zone: 2 to 9
Exposure: Full sun
Height: 4″ to 6″
Width: 1′ to 4′
Bloom time: Spring
Flower color: Periwinkle blue

Speaking of Phlox subulata, it also makes our list of blue flowering plants.

Creeping phlox is an easy-to-grow perennial that makes a wonderful, periwinkle blue ground cover.

In the spring, it is covered in blooms, and the plant is dense enough to discourage most weeds.

While it spreads out quite a bit, it isn’t invasive. You can easily pull it out if it’s growing where you don’t want it.

Give creeping Phlox a trim in the summer after it has finished blooming to encourage even more blooms the following year.

6 | Salvia

Zone: 8 to 10
Exposure: Full sun
Height: 3′ to 4′
Width: 1′ to 2′
Bloom time: Summer to fall
Flower color: Dark blue

The Salvia plant family has a few blue varieties, but Salvia guaranitica “Black and Blue” is my favorite.

It has a stunning combination of bright blue flowers with black stems.

Like most Salvias, it requires very little work and blooms all summer long.

However, it is a tender perennial that should be treated as an annual in some parts of the country. (It comes back every year in my zone 7 garden in South Carolina.)

7 | Virginia Bluebells (Mertensia virginica)

Zone: 3 to 8
Exposure: Part shade to shade
Height: 2′
Width: 2′
Bloom time: Spring
Flower color: Pale blue

Virginia Bluebells (or Virginia cowslip) are blue flowering plants that are native to North America and require almost no maintenance.

It sends up flower stalks in the spring that start out with pink buds and then open to light blue blooms.

The plants will go dormant in the summer, so be sure to plant it with other later-blooming perennials that will cover the bare spots.

8 | Clematis

Zone: 3 to 8
Exposure: Part shade
Height: 4′ to 10′ (depending on the variety)
Width: 2′
Bloom time: Spring to fall (depending on the variety)
Flower color: Dark blue, light blue, purple-blue

Clematis is a perennial vine that has beautiful flowers, doesn’t take much maintenance and usually “plays nicely with others”.

In other words, most varieties can be grown in, on and around other plants without causing issues.

Add there are many varieties with different shades of blue flowers that bloom at different times.

So if you choose wisely, you could have blue blossoms in your garden all season long!

Find out more about growing clematis HERE.

9 | Columbine (Aquilegia)

Zone: 3 to 9
Exposure: Part shade to sun
Height: 1′ to 2′
Width: 1′ to 2′
Bloom time: Spring to early summer
Flower color: Royal blue, purple blue

Columbines are another very easy to grow, native, blue flowering perennial.

While they are not invasive, they do tend to self-seed, and you will often find a couple of new plants growing where you didn’t plant them.

But with such pretty flowers and leaves, I usually just let them be.

10 | Forget-Me-Nots (Myosotis)

Zone: 4 to 9
Exposure: Shade
Height: 6″ to 2′
Width: 6″ to 12″
Bloom time: Spring
Flower color: Light blue

Forget-me-nots are another native plant.

It has very pretty star shaped, sky blue flowers in the spring and is very easy to grow.

These plants do tend to self-seed, so they work very well for naturalizing a wooded area.

But in your garden, you may need to spend some time removing the new plants that pop up every year where you weren’t expecting them.

11 | Blue Delphiniums

Zone: 3 to 7
Exposure: Full sun to part sun
Height: 1′ to 3′
Width: 1′ to 2′
Bloom time: Summer
Flower color: Deep blue

Delphiniums are a summer-blooming perennial that provides true blue flowers on long flower stalks.

The standard varieties often need staking, so are a little more work than some of the plants on this list.

However, they are such a beautiful blue, I couldn’t leave them off!

Delphiniums don’t like hot weather so tend to do better in northern climates than in the south. 

But I love them so much that in my South Carolina garden, I plant them as annuals in the spring (they always die in the heat of the summer).

12 | Blue false Indigo (Baptisia)

Zone: 3 to 10 (depending on the variety)
Exposure: Full sun to part sun
Height: 3′ to 5′
Width: 2′ to 3′
Bloom time: Summer
Flower color: Indigo blue

False Indigo is another blue flowering perennial that produces tall stocks with indigo blue flowers during the summer.

But it is a native plant and is much more tolerant of heat than Delphiniums.

It is long blooming and long lived, producing more and more flowers each year after it is established.

This plant does get quite big, so make sure to give it lots of room to grow.

13 | Cranesbill (Perennial Geranium)

Zone: 4 to 8
Exposure: Part shade
Height: 12″ to 18″
Width: 12″ to 18″
Bloom time: Summer
Flower color: Violet blue

Perennial geraniums are not to be confused with the annual geranium that usually has pink or red flowers.

These plants are another easy to grow perennial that provide really blue blooms and require very little maintenance.

They form small mounds that flower in the late spring through the summer.

Cutting them back after the first blooms are finished will encourage a second round.

14 | Siberian bugloss (Brunnera macrophylla)

Zone: 3 to 8
Exposure: Part shade to shade
Height: 12″ to 18″
Width: 18″ to 24″
Bloom time: Early spring
Flower color: Light blue

Brunnera macrophylla is a low-growing perennial with large leaves that blooms early in the spring.

It can be planted in the shade and doesn’t require much maintenance other than consistent watering.

As a bonus, many of them have very pretty leaves that will look good in your garden even when they are not blooming.

These plants do not do well in hot and humid weather, so are harder to keep alive if you are gardening in the South East.

15 | Lily of the Nile (Agapanthus)

Zone: 6 to 11
Exposure: Sun to part shade
Height: 3′ to 5′
Width: 2′ to 3′
Bloom time: Summer to fall
Flower color: Various shades of blue (depending on the variety)

Lily of the Nile grows from a Rhizome that slowly expands to form a 2 to 3 foot clump, producing many ball-shaped blue flowers.

It can be a little finnicky to get going. But once it is established, it requires very little maintenance.

And will bloom all summer long.

16 | Hydrangea macrophylla

Zone: 3 to 9
Exposure: Part shade
Height: 2′ to 6′ (depending on the variety)
Width: 2′ to 6′
Bloom time: Summer to fall
Flower color: Blue

Hydrangea macrophylla is a large perennial or small shrub that has a lot of blue varieties.

In fact, for many lace-cap hydrangeas (above) and mophead hydrangeas (below), you can actually control how blue the flower is. The more acidic the soil the bluer they will be.

If your flowers are pink or just not blue enough for your liking, add some soil acidifier (like you would normally put on rhododendrons), and watch the bloom colors change.

Note: This trick won’t work with white hydrangeas, or the Hydrangea paniculata varieties, so you make sure you have one of the pink or blue Hydrangea macrophylla varieties.

If you’re having problems with your hydrangeas not blooming at all, click here to get some help figuring out what the problem may be.

That’s it for our low maintenance blue flowering perennials. Hopefully you have found some inspiration to include one or two in your garden!

Other blue flowering plants you might like

• Blue plants for containers in the shade
• Purple and blue perennials for part shade
• Early spring blue flowering plants

Have comments or questions on on our blue flowering perennials? Tell us in the section below.

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