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  4. Care Guide: Planting Allium Bulbs

Care Guide: Planting Allium Bulbs


So, you’ve bought those beautiful allium bulbs, ready to plant and watch them sprout their petals. But wait: What do you do with them now?

In this post, we will show you how to plant allium bulbs in four easy steps. Let’s get started! Read on to learn more about planting allium bulbs.

When and Where Should I Plant my Allium Bulbs?

Alliums make a big statement in the late spring/ early summer months. You can plant your allium bulbs from late autumn to spring, so long as the soil is not frozen or waterlogged. They are not fussy about soil type, but they must be well-drained and receive plenty of sunlight and water.

Alliums need a lot of sunlight throughout the day, and often lean to find some when placed in the wrong area. To prevent this, make sure you find an area with full sun and well-drained soil. Like most bulbs, they don’t like soil that is too moist, so add some horticultural grit to the base of the hole if necessary.

Planting Alliums in the Garden

Once the perfect spot has been found, dig holes in the flower bed that are three times the size of the bulb itself, and place the bulbs in the holes with the pointy end facing upwards. If the soil is heavy, add a 5cm layer of horticultural grit to the base, or even mix the grit with the soil to cover the bulb and improve drainage. For this, you will need to mix 1 part grit with 2 parts soil.

Make sure to space your bulbs 20-30cm apart. As with many bulbs, you can add potash feed to enhance growth and strength, encouraging the bulbs to flower year after year.

Planting Alliums in a Pot

For gardens with limited space, consider creating a full spring flower display using the bulb lasagne method. This requires using multi-purpose soil and a large pot with good drainage. To fulfil the method, it requires adding a bottom layer of soil (around 10cm) and evenly spacing the larger bulbs above, with the pointy end facing upwards. Then add another layer of soil (around 5cm deep) and repeat, using smaller bulbs on each layer. For the best effect, try to avoid planting a bulb directly above another. Once these are planted, water lightly so that the soil is moist. For more indepth instructions on making a bulb lasagne, read our article now

How to Care for Alliums

  • Cut back alliums at the end of the blooming season
  • Remove any dead foliage in early summer
  • If the stem turns brown and hollow, detach the stem at the base
  • Monitor for any signs of diseased foliage

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Updated on September 11, 2023

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