Updated at: 06-06-2022 - By: Sienna Lewis

Delphiniums are a sight to behold. Their flower spikes, which bloom in the months of June and July, can grow to over 2 meters in height. It is likely that they are most well-known for their sapphire blue hues, however there are also mauve and pink varieties as well as white and red varieties. Depending on the cultivar, the blossoms may be single or double.

Roses, peonies, and other taller flowers, including lupins and verbascums, go nicely with delphiniums in cottage gardens and herbaceous borders. They attract bees and look beautiful in a vase.

Ranunculaceae Delphiniums have been planted in the UK for millennia and are part of the buttercup family. Delphinium gets its name from the Greek word delphinos, which means dolphin in reference to the opening blooms’ form. larkspur, which dates back to the Tudor era, is the popular name for these flowers.

Annual and biennial forms of the delphinium are also available. The Elatum Group of delphiniums are the most common and the tallest, with spikes of single or double flowers that can reach up to 2 meters in height. There are single flowers on shorter, looser-growing belladonna delphiniums. They were developed in the late 1950s and early 1960s and are perennials or biennials that live only a few years. They resemble ‘Elatum’ delphiniums in appearance, although they are lower in height. Delphiniums in the “Magic Fountain” series can be grown in tiny gardens because they are short and compact.

Delphiniums - cutting back in June - YouTube

To maintain their aesthetic appeal, delphiniums require regular attention. In the spring, they need staking, moist soil, and a lot of food. If you cut them down to the ground after flowering, you may be rewarded with a second flush of flowers in September.

How to grow delphiniums

To maintain their aesthetic appeal, delphiniums require regular attention. In the spring, they need staking, moist soil, and a lot of food. If you cut them down to the ground after flowering, you may be rewarded with a second flush of flowers in September.

To keep them looking their best, delphiniums require some attention. It is important to protect them from slugs in the spring, stake them, keep the soil moist and feed them frequently. After the flowers have faded, you may get a second flush of blooms in September if you trim them down to the ground.

  • How to ensure year-round color in your landscape
  • These are the top 20 perennials.
  • Cut flowers from perennials
  • Incorporating delphiniums
  • Taking proper care of daffodils
  • Deficiencies and pests of Delphinium
  • Where can you get delphiniums?
  • Delphiniums are ready to be planted.

Where to grow delphiniums

To get the greatest results, plant delphiniums in full sun, in wet soil that drains well. The back of a sunny border is the greatest place for delphiniums because of their height. Plants might be blown over in windy areas, so stay away from them.

How to plant delphiniums

The optimum time to grow a delphinium is in spring or fall, when the soil is warm and moist. To give nutrients to the soil, apply a layer of compost or well-rotted manure to the bottom of the hole before planting. Because delphiniums do not do well in wet winters, it is recommended that heavy soils be amended with grit to improve drainage. Gently back-fill your delphinium with dirt, then gently firm it in place to avoid damaging the roots. Water from the well.

Where to buy delphiniums online

  • Morgan, Thompson
  • The Blackmore & Langdon partnership
  • Crocus
  • Suttons
  • Dutchman Van Meuwen
  • Primrose

How to care for delphiniums

Growing delphiniums – attaching the stem of a delphinium

For taller kinds, spring is the optimum time to stake canes or a frame that the plants can grow through. Because delphiniums like lower summer temperatures and somewhat moist soil, it’s important to keep them watered to prevent them from drying out.

If you clip back the flower spikes of delphiniums as soon as they have faded, you can encourage the plants to produce a few flowers in late August or September.

Reducing the size of a delphinium

  1. The flower spikes should be trimmed to the ground as soon as they begin to deteriorate, leaving any emerging side shoots and the base of any foliage that remains.
  2. The plant needs a lot of water.

Cut back delphiniums in early summer once they’ve blossomed like Monty Don shows above.

Cut the plant back to the ground in the fall once it has stopped flowering.

Every few years, spring is a good time to divide your plants.

How to Prune Delphinium

If you’re looking for an eye-catching accent in your flower beds or containers, you’ll want to consider delphiniums (Delphinium elatum). The height of a delphinium plant in a pot or garden bed varies from 3 to 8 feet, and each spike is covered in tiny flowers. Pink, white, blue, and purple flowers can be found on delphiniums. Depending on the type and the local climate, they can be grown as annuals, biennials, or perennials, depending on the size of the plant. It’s possible to induce a second blooming season with light pruning during the summer months. Pruning helps perennials get ready for the winter as well.

When to cut back delphiniums - top tips to maintain a perfect garden | Express.co.uk

Things You Will Need

  • Sterilized clippers or shears are required.
  • A tub or bucket
  • Disinfectant for the home

1. Thin Flower Stalks

Mildew can thrive in overcrowded delphiniums. Make sure that the plants don’t generate too many bloom spikes at once. It’s critical to prune delphiniums in this manner to keep them healthy, but avoid pinching back delphinium plants below the flower stalks if you don’t want to lose the season’s worth of blooms.

2. Remove Wilted Stalks

When two-thirds of the blossoms on the stalk begin to wilt, cut the flower stalk off of the plant. Remove the stalk at the point where it joins a secondary stalk or slightly above the leaves towards the base of the plant with sterilized pruning shears or by simply breaking it off.

3. Deadhead Spent Blooms

In order to prevent the plant from reproducing, remove the flower heads as soon as they are done flowering. Early in the summer, most of the stalks will have died back. According to the University of Vermont, deadheading like this helps the delphinium to blossom again this season. Leaving flower stalks to generate delphinium seeds depletes the plant’s foliage and roots of energy, which prevents reblooming, according to Penn State Extension.

4. Trim the Plant

You should cut down your whole daffodil plant to within a quarter inch of its root. In a compost pile or bin, put the old stalks and stems. A second flush of bloom, especially on perennials, may be induced by severe pruning in the early summer.

5. Preparing for Winter

Pruning delphiniums in the fall, using the same stalk removal strategy as in the spring, is an important part of delphinium winterization. Once the flowers have faded, cut the plant back to the basal leaves only, and allow the foliage to die naturally throughout the winter.

6. Compost Stalks and Stems

During the growth season, when you prune and deadhead plants and remove their stalks and stems, you can either compost the debris or collect mature seeds from the stalk bottoms by opening the seedpods and shaking them out. Start fresh plants from these delphinium seeds this winter.


Delphiniums are dangerous to people and some animals, according to research conducted by the University of Florida’s Institute for Food and Agricultural Sciences (IFAS). Delphinium seeds and plants should not be eaten or ingested by anyone, including children and dogs.

How to propagate delphiniums

Sowing Delphinium ‘Galahad’ seeds is the first step in growing delphiniums from seed.

Delphiniums can be successfully propagated by taking cuttings from the base of the plant in the spring (basal cuttings).

To take delphinium cuttings, follow these steps:

  1. Take a sharp knife in the spring and cut a fresh shoot slightly below the soil’s surface. Take a couple of shoots from each plant you’re working with.
  2. A plastic bag should be used immediately to keep the cutting moist.
  3. Cut down some of the top foliage, but leave a few leaves in place to provide nutrients for the roots.
  4. Using perlite and multipurpose compost, prepare a small container for each cut.
  5. To prevent the leaves from drying out, spritz them frequently with water and cover with a plastic bag.
  6. On a sunny windowsill in the greenhouse or in a greenhouse

Here, Monty Don demonstrates how to take delphinium basal cuttings:

How to take delphinium basal cuttings

How to plant rooted delphinium cuttings is explained by Monty here:

Potting on cuttings of delphinium

Growing delphiniums: problem solving

Problem solving is the key to growing delphiniums.

Keep the soil around your delphiniums moist to prevent powdery mildew damage.

Rust, which creates rust-colored pustules on the foliage, can also harm them. Whenever you see a leaf that has been impacted, remove it immediately and clean away any fallen leaves.

  • Rust should be dealt with.

A bacterial illness that results in enormous black blotches on delphinium leaves is known as the delphinium black blotch. At its worst, it can decimate an entire plant’s health during wet summers. The only way to stop the spread of this illness is to eliminate any infected plants.

Advice on buying delphiniums

  • Keep in mind that delphiniums have the potential to grow to enormous proportions, so be sure to inquire about the final height of any varieties you are considering.
  • The greatest place for delphiniums to flourish is in full sun, so make sure you have that in your yard.
  • Delphiniums can be purchased at local nurseries and garden centers, as well as through internet specialty shops. Look for little plug plants in the spring to save money when purchasing delphiniums.
  • Keep an eye out for vibrant, vigorous foliage that shows no symptoms of pests or disease….

Where to buy delphiniums online

  • Morgan, Thompson
  • The Blackmore & Langdon partnership
  • Crocus
  • Suttons
  • Dutchman Van Meuwen
  • Primrose

Delphinium varieties to grow

Delphinium ‘Amadeus’

The height x spread: 1.5m x 1m

  • Blackmore & Langdon is a good source to get Delphinium ‘Amadeus.’

High-status delphinium ‘Pacific Hybrids,’ which come in a variety of colors. It is a perennial with a limited lifespan.

The dimensions are 150 cm high by 75 cm wide.

  • To buy Delphinium “Pacific hybrids” from Thompson & Morgan, go to their website.
  • From Van Meuwen, you may purchase Delphinium ‘Pacific Hybrids.’

Single or double Delphinium ‘Rising Stars’ in a range of colors. When planted in large groups, they make a striking display and are also excellent cut flowers.

The dimensions are 150 cm high by 75 cm wide.

  • Thompson & Morgan sells Delphinium ‘Rising Stars Mixed’
  • From Van Meuwen, buy Delphinium ‘Rising Stars Mixed’

Compact plants appropriate for tiny gardens are the Delphinium ‘Magic Fountain Series.’ Many different colors are available, with an eye at the center of the design.

It measures 90cm by 60cm.

  • Primrose sells Delphinium ‘Magic Fountain Mixed’
  • Thompson & Morgan is your source for Delphinium ‘Magic Fountain Mixed.’

Tall spikes of deep blue double blooms with black centers appear on the Delphinium elatum ‘Faust’.

Pruning Delphiniums - YouTube

In terms of height and width, the dimensions are: 2.5 x 1

  • Visit Primrose to get your hands on some Delphinium elatum ‘Faust’
  • From Blackmore & Langdon, you may get Delphinium elatum ‘Faust’

“Cinderella” delphinium was named “Best New Plant Introduction for 2019” by BBC Gardeners’ World Live for its compact, pale pink foliage and triple-flowered blossoms.

1.2m x 80cm

Why Delphiniums?

You could be asking yourself, “Why delphiniums?” In addition to their beauty and elegance, they are popular in the Northern Hemisphere and Africa, where they are widely grown.

In addition to their beauty, delphiniums are prized by many for their association with cheer and benevolence. As a memento mori, it’s an appropriate way to honor departed loved ones.

Despite its popularity and beauty, growing delphiniums is a difficult task for many growers. It’s a delicate plant, so you’ll need to take into account a wide range of variables.

So, you’re wondering how to trim delphiniums? Here are some suggestions: 1.

Steps In Cutting Back Delphiniums

The main stalk of delphiniums is frequently trimmed back by farmers in order to increase productivity and bloom size. They do this because they believe that the plant will grow back with more leaves and a more impressive display in the future. ‘ Cutting or pruning both refer to this action.

Pruning is the process of selectively eliminating a portion of a plant in order to encourage new growth. Your eyes will light up when you see how a single stem may be transformed into a three-pronged one.

So, you’re wondering how to trim delphiniums? Here are some suggestions: 1.

#1 Start the process when leaves are falling off

If the delphinium leaves begin to fall off, it’s time to remove them from the garden. It’s a bad indicator if the plant is unable to adjust to changes in the environment.

If two-thirds of the leaves have already withered, start with the first step. This is more common in the warmer months of the year. If you do it in the spring, you’ll be able to witness it blossom the following year.

#2 Prepare your tools

We recommend shears and bypass pruners for this task. Many growers also advocate the use of these tools. When cutting delphinium stems, make sure your tool is clean and sharp.

#3 Time to cut the stalk

It’s as simple as snipping off the stalk. Remove it from the ground. Keep in mind that there are numerous factors to take into account before moving on with this stage. There is a lot of follow-up work that needs to be done after the cutting process is complete.

#4 Eliminate every flower stalk (optional)

This is an important step to remember if you performed this in the spring and want to ensure that the stalk is already back in summer.

After the flowers have faded, you must remove all of the stems. This reduces the likelihood of it producing seeds. Remember that this method is entirely at your discretion.

#5 Do the trimming from the base

The perennial variety of delphinium. It has been noticed that this variety of plant has a second flush of bloom if it is frequently and severely trimmed down. The plant’s base should be trimmed by a quarter inch at this time.

#6 Trimming the leaves

Trim back all of the base leaves as soon as it stops blooming and begins to fall.

Tips Before Cutting Back Delphiniums

To thrive, Delphiniums need a cool and damp climate. Due to the intense heat, it’s unusual to see this flowering and flourishing in the summer. Here are a few pointers for getting better-looking delphiniums.

#1 Know where you will plant it

Let’s begin with the simplest of tasks. You must, of course, ensure a healthy and fertile soil. Plant it in a location that receives plenty of sunlight and is exposed to strong breezes if you want it to thrive.

It’s important to remember that because of its sensitivity, this plant may not thrive at temperatures below 50 degrees Fahrenheit. It’s a given that it won’t be able to withstand high temperatures.

#2 Determine when you will plant it

Planting it in the spring is ideal, in our opinion. Spring is a time of growth and fertility, thus many plants are expected to bloom. Spring is the ideal time to plant delphiniums because of their hardiness and tolerance of high temperatures.

#3 Understand what the plant needs

All plants can’t exist without it. We recommend that you water your Delphiniums on a regular basis because they require a lot of water. You need to make sure that the soil is still damp and moist. If you don’t water it, you won’t enjoy the results because it dries quickly and easily.

#4 Plant in a convenient place

Be aware that it dries up quickly when planted in a pot. It’s recommended that you plant delphiniums in the ground because it can hold more water than a potted plant. Nonetheless, if you must plant in a pot, you needn’t fret; all you need to do is keep an eye on it every now and again.

Even so, they may not be sufficient. Yes, you can rest assured that your plants will flourish. This means that it will not only look good in the spring but will also look good all year round thanks to your efforts.


Keep in mind that taking care of delphiniums is not at all simple. Of course, if you put in the effort, you’ll be pleasantly surprised by the outcome. When it comes to improving the health of your plants, cutting back is a proven method. Let’s put it forward because of its results with delphiniums.

If you follow the correct procedure for cutting back delphiniums, everything else will fall into place. I’m hoping the information in this post will be useful to you in your quest for more beautiful flowers and higher yields.