The Blue Mirror Delphinium (Delphinium Grandiflorum ‘Blue Mirror’) Care Guide

The Blue Mirror Delphinium, otherwise known as the Delphinium Grandiflorum ‘Blue Mirror’ or Delphinium ‘Summer Blues’, Chinese Delphinium ‘Summer Blues’, Bouquet Delphinium ‘Summer Blues’, Summer Series, is a rather well known perennial plant by gardening enthusiasts around the world.

Best known for its average maintenance and moderate growth, this perennial will likely liven up your house (or garden) with its green colored leaves. But, only if you learn how to take proper care of it for it to thrive.

This is why all the topics you need to know in order to achieve this will be covered in this Blue Mirror Delphinium Care Guide. Ready? Let’s go!

In order to take proper care of your Blue Mirror Delphinium you’ll need to keep in mind the following guidelines:

  • Water: The Blue Mirror Delphinium prefers constant watering each week and more during the hot season.
  • Light: Keep your Delphinium Grandiflorum ‘Blue Mirror’ in an environment where it can receive partial to full sun on a daily basis. 
  • Soil: Make sure to keep the Blue Mirror Delphinium in soil with moist but well-draining properties, so ideally, one that is made of clay, loam, chalk, and sand.

And as with many other plants, these are the only three care factors you need to remember to make sure your Blue Mirror Delphinium is, for the most part, healthy and well to survive.

Blue Mirror Delphinium care

Scientific / Botanical Aspects

In botanical terms, the Blue Mirror Delphinium belongs to the Ranunculaceae family, the genus Delphinium and the species Grandiflorum, hence its scientific (or botanical) name Delphinium Grandiflorum ‘Blue Mirror’ (del-FIN-ee-um gran-dih-FLOR-um).

As with other Delphinium’s, the Blue Mirror Delphinium is a herbaceous plant, which means it will die back to the ground every year. 

Growing Region

As a rule of thumb, we recommend to always keep in mind your plants’ native region and environment, since these are the conditions that your Blue Mirror Delphinium is most accustomed to, thus where it can most favorably.

With this in mind, the Delphinium Grandiflorum ‘Blue Mirror’ will be most used to the heat zones in the 1 – 7 region, as the plant hardiness level falls between 3a, 3b, 4b, 4a, 5a, 5b, 6a, 6b, 7b, 7a and the ideal climate zone is between 1, 1A, 1B, 2, 2A, 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, A1, A2, A3.

Growth and Size


In terms of size and growth, the Blue Mirror Delphinium is a relatively moderate grower, which makes things somewhat easy for any plant enthusiast.


But, how big does the Blue Mirror Delphinium actually get? What should you expect in terms of size? Let’s dive right in…

The Delphinium Grandiflorum ‘Blue Mirror’ can grow up to 10″ – 1′ (25cm – 30cm) in 10″ – 1′ (25cm – 30cm) and 10″ – 1′ (25cm – 30cm) in 10″ – 1′ (25cm – 30cm). 

These dimensions make the Blue Mirror Delphinium a relatively medium perennial compared to others, so it’s best to keep this fact in mind since it will affect where you want to keep yours at home.

This is why experts recommend keeping an area of approximately 12″ (30cm) free so the Blue Mirror Delphinium can spread to its best extent.


In terms of watering, the Blue Mirror Delphinium is a fairly simple plant to take care of.

This is mostly because it has a straightforward watering schedule and somewhat regular watering needs.

Specifically, most experts agree that the Delphinium Grandiflorum ‘Blue Mirror’ prefers constant watering each week and more during the hot season.

Which is why it is considered a plant with relatively average needs in terms of water. 

Blue Mirror Delphinium plants


As a rule of thumb, you should remember to keep your Blue Mirror Delphinium in soil with moist but well-draining characteristics, as these will guarantee the right conditions for your plant to grow and thrive. 

But, if you want a ‘one-size-fits-all’ solution to watering your Blue Mirror Delphinium then you should consider the famous ‘finger’ test. To perform this test, you just need to put your finger in your plant’s soil and determine if it’s moist or not. If it is, then don’t water; if it isn’t, then please do. In any case, this test will allow you to know if your Blue Mirror Delphinium needs or does not need water, every time.

Soil Mix

The Blue Mirror Delphinium’s ideal soil potting mix is made out of clay, loam, chalk, and sand.

In addition to this, expert gardeners recommend having preferably alkaline, acid or neutral soil.

Light and Exposure

In terms of light & exposure, the Blue Mirror Delphinium requires partial to full sun in order for it to thrive under the right conditions. 

Most experts agree that this perennial will do well as long as you keep it in full sun, and it will be able to grow properly.

Specifically, we recommend that you place your Delphinium Grandiflorum ‘Blue Mirror’ in full and direct sun (more than 6 hours of direct sunlight per day).


Being a herbaceous plant, the Blue Mirror Delphinium will die back to the ground every year. 

But, you can expect it to have its ‘prime-time’ during the summer (early, mid, late).


You can expect your Blue Mirror Delphinium to flower around the spring months from April to June (spring).

In particular, this perennial is well known for its flowers for cutting and showy flowers around the plant enthusiast community.

The Blue Mirror Delphinium produces some beautiful blue, or blue flowers around this time of year.


The leaves from the Blue Mirror Delphinium have a beautiful green color during most of the year.

Blue Mirror Delphinium up close

Attracts, Tolerance and Resistance

The Blue Mirror Delphinium is well known for being able to attract hummingbirds and butterflies, so keep that in mind when choosing your plant, as you’ll likely end up finding one or another in your garden.

Additionally, it has a special tolerance for animals like rabbit and deer, so don’t worry if any of these come along, your Delphinium Grandiflorum ‘Blue Mirror’ will be fine.


Now, let’s talk garden and how your Blue Mirror Delphinium will look best in it.

Most Delphinium Grandiflorum ‘Blue Mirror’ owners agree that this perennial will look great in most cottage and rustic gardens of all types. 

Other owners consider that they complement well most gardens of gravel and rock garden, city and courtyard, and in informal and cottage styles. 

In particular, the Blue Mirror Delphinium’s best location within your garden is in edging, beds and borders, and in patio and containers, others use it for landscaping in a container, mass planting, border, cutting garden, or a woodland garden.

Companion Plants

Blue Mirror Delphinium’s do well with some other plants beside it. One good companion plant is the Gaillardia, which will pair up nicely with your leafy friend.

Others consider that a nice Rudbeckia will work well too, so choose whichever you find works best for you!


And we’ve come to an end. Fortunately, that’s everything you need to know about your Blue Mirror Delphinium to keep it safe and sound in your garden or home. Enjoy planting!

Sebastian Moncada

I’m also a plant enthusiast and researcher. I’ve been privileged to have lived my whole life around the wilderness of Colombia and I’m happy to share everything I learn along the way. “Adopt the pace of nature. Her secret is patience” – Emerson.

Recent Posts