Allium Guide: When and How to Plant Them

Alliums are plants of exquisite beauty that deserve a place in perennial gardens. Easy to grow and undemanding, these ornamental bulbs come in a diverse range of colour, height and bloom times, to give you beautiful blooms from spring all the way through till summer.

Throughout this Allium blog, we will guide you through our most popular varieties, planting partners, a full planting guide and even video planting tutorials to get you ready for your autumn bulb planting.

Top Varieties

Allium Graceful Beauty

A striking new variety. This elegant Allium will dazzle in the summer garden with their white and pink flushed flowers. Easy to grow and compact, this bloomer will dazzle at the front of the border. Also they are perfect for attracting wildlife!

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Allium Drumsticks

A lovely addition to the border. Add interest and movement to the late-spring garden with these unique and vibrant egg-shaped flower heads.  As well as being long lasting and pollinator-friendly, these Alliums make beautiful cut flowers!

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Allium Gladiator

An RHS Garden Merit Award-Winner. Allium Gladiator showcases dozens of small star-shaped purple blooms which are long lasting and naturalise easily for years of pleasure. Spectacular in large, sweeping drifts.

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 Allium Globemaster

Boasting massive spherical violet heads, this award-winning Allium is a great tall addition to beds and borders. This showstopper naturalises easily and they are perfect for bringing butterflies fluttering to the garden.

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Alliums look beautiful alongside…

Forming a succulent mat of foliage around the base, then springing into flower some time after the Alliums have faded. Click here to view our Sedum Range.

Partner the taller Allium varieties alongside delphiniums for a border filled with architectural beauty and height. Click here to view our Delphinium Range.

Create a border rich in colour and shapes. Poppies and Alliums both excel in the garden as elegant vertical accents with architectural interest. Click here to view our Poppy Range.

Planting Guide

Planting time: September – December 📆

Location: Full Sun/Partial Shade ☀

Flowering Time: Late-Spring-July 🌸

Soil Type: Fertile, well-drained soil 🏡

For ground planting:

  1. Remove any weeds before planting.
  2. Plant at 3-4 times the depth of the bulb and approx 10cm-15cm apart. Position the bulbs with the pointed end facing upwards.
  3. Fill in the holes and tread down lightly.
  4. Feed regularly in poor soils.
  5. After flowering, remove the leaves when they have withered.

For container planting:

  1. Make sure to use a deep and fairly large pot for large Allium bulbs.
  2. Use a good-quality potting compost.
  3. Plant the bulbs three times deeper than the height of the bulb and as far apart as you can.
  4. Water sufficiently after planting.
  5. For frost protection, use bubble wrap or garden fleece.

Tutorials

How to Plant Allium Superglobe: Summer Garden Guide
How to Plant Allium Superglobe: Summer Garden Guide
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How to Plant: Cactus Dahlias

Need help on how to plant Cactus Dahlias? In this blog, we’ve compiled a guide full of tips and advice on planting, arrangement, and aftercare for your Cactus Dahlias, to allow you to get the best performance from your plants.

 

 

 

 

 

 

 

 

 

 

 

This special, eye-catching variety of Cactus Dahlias are distinctive by their unusual shaped summer flowers, which look fantastic planted together for  colour bursting garden displays and borders, as well as when planted as a standalone item. They can flower until Autumn and have a wide range of interesting varieties, all with very showy flower shapes and rich colour shades.

Planting

Dahlia tubers can be planted 10cm deep in fertile well drained soil, outdoors in spring when the frost has disappeared. If you plant before the frosts are over, they may get frosted and die, so pot in March or early April for flowering in early July. They prefer to be in a sunny location and spaced at approximately 45cm apart.

Tips:

  • Dahlias start blooming about 8 weeks after planting, starting in mid-July.
  • Some gardeners start tubers indoors in containers a month ahead to get a jump on the season.

Video

In this video tutorial, our resident gardener Jeff covers how to plant Cactus Dahlia tubers in to pots and shares helpful tips and advice on how to achieve the best results out of your Dahlia plants.

Aftercare

  • There’s no need to water the soil until the dahlia plants appear; in fact, overwatering can cause tubers to rot. After dahlias are established, provide a deep watering 2 to 3 times a week, preferably more in hotter, dry climates.
  • In areas where there is extreme cold, dig up dahlias and store in a cool peat over the winter and then replanted the following year.
  • Apply a high potash fertiliser every few weeks in the summer to help growth and they can be dead headed when necessary.

Click here to view our full range of Cactus Dahlias.