15 Of The Best Easy Care Perennials With Beautiful Blue Flowers

Want to add some blue flowers to your garden but don’t want to do too much work? These easy care shrubs and perennials with beautiful blue flowers are just what you need. They all will look pretty in your garden and are all low maintenance plants.

low maintenance perennials with beautiful blue flowers
low maintenance perennials with beautiful blue flowers

Every year at around this time, 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 you might like these, too…

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

Globe Thistle (Echinops)

Globe Thistle
Globe Thistle

Zone: 3 to 9

Full Sun

Bloom Time: Summer to Fall

Height: 2′ to 4′

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

Globe Thistle blue flowers (Echinops bannaticus) ©xxsalguodxx - stock.adobe.com
Globe Thistle blue flowers (Echinops bannaticus) ©xxsalguodxx – stock.adobe.com

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!

Chaste Tree (Vitex agnus-castus)

Chaste Tree
Chaste Tree

Zone: 6 to 9

Full Sun

Bloom Time: Summer

Height: 15′ to 25′

The Chaste tree is covered with medium blue blooms that look something like crepe myrtle flowers. Okay, so this is really a blue-flowering tree, but since you don’t have to plant it every year, I include it in the perennial category 🙂

These plants grow fast, so they can quickly provide some height (and shade) in the garden…which is great if you are starting a new garden that needs some structure.

Catmint (Nepeta x faassenii)

Catmint
Catmint

Zone: 3 to 9

Full Sun

Bloom Time: Spring and Summer

Height: 1′ to 2′

Catmint is a perennial herb that produces blue flowers 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!

Hydrangea

Lace cap hydrangea
Lace cap hydrangea

Zone: 3 to 9

Part Sun to Full Sun (the further north you live, the more sun they can take)

Bloom Time: Summer to Fall

Height: 2′ to 4′

Hydrangeas are a plant (in this case, more of a bush) that has a lot of blue varieties.

Hydrangea Twist n Shout
Hydrangea Twist n Shout

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.

Perennials With Blue Flowers - Endless Summer Hydrangea
Endless Summer Hydrangea

Note: For clarification, 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.

Dutch Iris

Dutch Iris Sapphire Beauty
Dutch Iris Sapphire Beauty

Zone: 3 to 9

Part Sun

Bloom Time: Late Spring

Height: 2′

These beautiful blue irises have yellow throats which make the blue stand out even more. These grow from bulbs that you can plant in the fall, and make a beautiful display in the late spring.

15 Of The Best Easy Care Perennials With Beautiful Blue Flowers
Iris reticulata

The leaves die back after the plant has finished blooming, so it helps to plant them with later-blooming 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!

Salvia

Salvia guaranitica "Black and Blue"
Salvia guaranitica “Black and Blue”

Zone: 8 to 10

Full Sun

Bloom Time: Summer to Fall

Height: 2′ to 3′

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.

Virginia Bluebells (Mertensia virginica)

Yellow daffodils and bluebells © 2017 Kristen Prahl
Yellow daffodils and bluebells © 2017 Kristen Prahl

Zone: 3 to 8

Part Shade, Shade

Bloom Time: Spring

Height: 2′

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 flowers.

Virginia Bluebells
Virginia Bluebells

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.

Find some more suggestions for compact plants that grow in the shade HERE.

Clematis

Blue-flowered Clematis 'Sapphire Indigo'
Blue-flowered Clematis ‘Sapphire Indigo’

Zone: 3 to 8

Part Shade, Sun

Bloom Time: Spring to Fall

Height: 4′ to 10′

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).

Clematis Ice Blue
Clematis Ice Blue

Add on top of that…there are many varieties with 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 how to grow and prune clematis HERE.

Columbine (Aquilegia)

Rocky Mountain Columbine with blue flowers
Rocky Mountain Columbine

Zone: 3 to 9

Part Shade, Sun

Bloom Time: Spring to Early Summer

Height: 1′ to 2′

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

Perennials With Blue Flowers - Columbine ©Cora Müller - stock.adobe.com
Columbine ©Cora Müller – stock.adobe.com

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

Moss Phlox (Phlox subulata)

Phlox Subulata
Phlox subulata Blue Emerald

Zone: 2 to 9

Sun

Bloom Time: Spring

Height: 6″

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

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

Phlox subulata with blue flowers
Phlox subulata with blue flowers

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

Want to find more easy-to-grow plants that bloom in the spring? Click here to see our post.

Rose of Sharon (Hibiscus syriacus)

Rose of Sharon 'Blue Bird' is a beautiful shrub with blue flowers
Rose of Sharon ‘Blue Bird’

Zone: 5 to 9

Sun to Part Sun

Bloom Time: Summer to Fall

Height: 6′ to 10′

Rose of Sharon is a hardy Hibiscus…perfect for non-tropical gardens that want to have a tropical-looking flower! And it comes in blue!

It’s actually a blue flowering shrub rather than a perennial, but it works so well in my garden that I had to include it.

Rose of Sharon "Blue Bird"
Rose of Sharon “Blue Bird”

Throw in that they are easy to maintain and bloom later in the summer (when a lot of other plants are not at their best), and it’s easy to see why you would want one in your garden.

Note: In northern gardens, this plant is often late to start growing in the spring, so don’t chop it down thinking that it’s dead…most likely, it just hasn’t started putting out leaves yet.

Forget-Me-Nots (Myosotis)

Forget-me-nots by I, KENPEI [GFDL (http://www.gnu.org/copyleft/fdl.html), CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/) or CC BY-SA 2.5-2.0-1.0 (http://creativecommons.org/licenses/by-sa/2.5-2.0-1.0)] via Wikimedia Commons

Forget-Me-Notes by KENPEI [GFDL, CC-BY-SA-3.0 or CC BY-SA 2.5-2.0-1.0], via Wikimedia Commons

Zone: 4 to 9

Shade

Bloom Time: Spring

Height: 6″ to 2′

Forget-me-nots are another native plant. It has very pretty blue flowers in the spring and is very easy to grow.

Background of many blue flowers forget-me-not ©fotokate - stock.adobe.com
Blue-flowered forget-me-nots ©fotokate – stock.adobe.com

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.

Delphiniums

Delphinium oxysepalum by Opiola Jerzy (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html), CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/) or CC BY-SA 2.5-2.0-1.0 (http://creativecommons.org/licenses/by-sa/2.5-2.0-1.0)], via Wikimedia Commons

Blue Delphiniums By Opiola Jerzy (Own work) [GFDL, CC-BY-SA-3.0 or CC BY-SA 2.5-2.0-1.0], via Wikimedia Commons

Zone: 3 to 7

Sun, Part Sun

Bloom Time: Summer

Height: 1′ to 3′

Delphiniums are a summer-blooming perennial that provides truly 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…but they are such a beautiful blue, I couldn’t leave them off!

Delphiniums ©Gerisch - stock.adobe.com
Delphiniums ©Gerisch – stock.adobe.com

Delphiniums also 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).

Cranesbill (Perennial Geranium)

Geranium Johnson's Blue by Wouter Hagens (Own work) [Public domain], via Wikimedia Commons

Geranium Johnson’s Blue by Wouter Hagens (Own work) [Public domain], via Wikimedia Commons

Zone: 4 to 8

Sun, Part Shade

Bloom Time: Summer

Height: 12″ to 18″

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 flowers and require very little maintenance.

Blue meadow cranesbill ©jirka1 - stock.adobe.com
Blue meadow cranesbill ©jirka1 – stock.adobe.com

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.

Siberian bugloss (Brunnera macrophylla)

Brunnera macrophylla by Kor!An (?????? ??????) (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons

Brunnera macrophyla By KorAn (Own work) [CC BY-SA 3.0], via Wikimedia Commons

Zone: 3 to 8

Part Shade, Shade

Bloom Time: Early spring

Height: 12″ to 18″

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.

Brunnera Macrophyla "Jack Frost"
Brunnera Macrophyla “Jack Frost”

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.

Hopefully you have found some inspiration to include a blue-flowering plant or two in your garden!

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15 Of The Best Easy Care Perennials With Beautiful Blue Flowers
15 Of The Best Easy Care Perennials With Beautiful Blue Flowers
15 Of The Best Easy Care Perennials With Beautiful Blue Flowers

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4 Responses

  • G’day Wanda,and thank you for this most valuable data on blue flowers because you don’t always see many such colours in a garden,or may be I don’t look hard enough..I will visit my nursery in two weeks(work f/t) and take with me YOUR precious list..God bless you and your family and happy gardening..Ron Lock..Geelong,Victoria,Australia

  • hey wanda! My garden has a color palette of blue purple and white, with some deepred plants for contrast, like heuchera. My alltime favorites of blue arent on your list! so i thought i would just add them here. number one: Lithodora. stays pretty low, but grows wider each year and really intensly blue flowers! and is green through winter, also a plus. number 2: ceanothus. i have both the shrub variety and the climbing one, a softer blue, more like the echinops. fast growing, looooong blooming and smells lovely. and last but not least: lupine. who doesnt love those?
    loved the post, btw. greetings from holland!😁

    • Thanks for the additions to the list, Francis! I haven’t tried Lithodora or Ceanothus. They sound pretty. I’ll have to look into them. And you’re right, I forgot about Lupines 🙂

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