How to Plant Nectaroscordum / Allium siculum Bulbs

Depth, spacing & care (Autumn)

Nectaroscordum, now treated as Allium siculum, is a striking bulbous plant prized for its elegant, bell‑shaped blossoms and sculptural form. Its pendulous, waxy flowers in cream, green, and purple hues dangle beneath a pointed, papery sheath, creating an umbrella of subtle color. After flowering, the seed pods rise upright, offering structural interest even into late summer.

Its twisted, gray-green leaves emerge before or during flowering, providing a distinctive foliage texture. Because of its garlic‑family roots, the plant is largely ignored by deer, rodents, and many pests. Nectaroscordum performs beautifully in borders, woodland gardens, or mixed beds, and attracts bees without being invasive.

How to plant

When to Plant

Plant Nectaroscordum bulbs in autumn — ideally between September and early November. This timing gives them enough time to establish roots before cold winter sets in.

Where to Plant

Select a spot in full sun or partial shade. The soil should be well-draining — this plant dislikes sitting in wet ground. It tolerates moderate moisture but will perform best where excess water can drain away.

Preparing the Soil

Dig and loosen soil to a depth of about 15–20 cm, removing stones, roots, and clumps. If your soil is heavy or clay‑based, mix in compost or coarse grit to improve structure and drainage.

Planting the Bulbs

Position each bulb with the pointy end facing upward. Plant them at a depth of about 15–20 cm, spacing them about 15–20 cm apart. In containers, you may place them closer for a denser show.

After Planting

Water gently after planting to help settle the soil around the bulbs. After this, additional watering through winter isn’t typically necessary unless conditions are unusually dry.

Spring Growth and Flowering

In late spring to early summer, clusters of drooping bell-shaped flowers appear atop slender stems. As they mature, the hanging flowers turn upright to reveal the seed pods. The foliage and stems add graceful form and texture to the garden.

After Blooming

Let the foliage and flower stems die back naturally. Don’t cut them prematurely, as they’re doing essential work feeding the bulb for next year. Once the leaves are fully yellowed and withered, tidy up the area. Nectaroscordum may self-seed or produce offsets — if you don’t want more, remove seed pods or seedlings.

Extra Growing Tips

  • Nectaroscordum looks wonderful planted in drifts or clusters, especially among lower perennials that won’t overshadow it.
  • Because it’s largely pest-resistant and ignored by browsing animals, it’s a good option in bulb collections with deer or rodent pressure.
  • Use deep pots with good drainage if planting in containers.
  • The seed heads are decorative and make good dried material for flower arrangements.