How and when to plant allium bulbs
Alliums are ornamental plants from the onion and garlic family, prized for their spectacular globe-shaped flower heads in shades of purple, pink or white. They are an excellent choice for borders, mixed beds and contemporary gardens, where they add both structure and a modern accent. To enjoy strong and healthy blooms, allium bulbs must be planted correctly and at the right time.
When to plant allium bulbs
The best time to plant allium bulbs is in autumn, from September to November, before the ground freezes. At this stage, the soil is still workable and the bulbs can develop roots before winter. In spring, they will flower from May into June, depending on the variety.
Where to plant allium bulbs
Alliums prefer sunny positions but will also tolerate partial shade. The soil should be well-drained, as bulbs are sensitive to excess moisture. In heavy or clay soils, mix in sand or gravel to improve drainage. Alliums combine beautifully with perennials and ornamental grasses, creating striking garden displays.
Step-by-step planting guide
- Dig holes at a depth of about two to three times the height of the bulb (usually 10–15 cm).
- Place the bulbs with the pointed end facing upwards and the base downwards.
- Leave 15–20 cm spacing between bulbs, depending on the variety.
- Cover with soil and press down lightly.
- Water after planting to encourage rooting.
Care after planting
Allium bulbs do not need additional watering during winter. After flowering, allow the leaves to die back naturally so the bulb can store energy for the following year. Every few years, bulbs can be lifted and replanted to prevent overcrowding and to maintain abundant flowering.
Summary
Allium bulbs are best planted in autumn, 10–15 cm deep, in a sunny position with well-drained soil. With correct planting and minimal care, alliums will reward you with dramatic, globe-shaped flowers that bring unique charm to the garden in late spring and early summer.
