2 named cultivars

bulb corm tuber

Persian Onion

Allium hollandicum

The Story

Plant Bio

Allium hollandicum, commonly known as ornamental onion, is valued for its large, globe-shaped clusters of purple flowers and upright, arching foliage. It tends to attract pollinators and is great for borders and perennial gardens.

The cultivar produces larger flower heads compared to other Allium species, making it a focal point in any garden.

Uses & Benefits:

Adds striking spherical purple blooms to garden borders, attracting pollinators.

Bulbs can be harvested for culinary uses and natural pest repellents.

Supports pollinator populations, especially bees and butterflies.

Essentials

At a Glance

Plant Type

Bulb Corm Tuber

Height

30 inches

Width

12 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8

Water

Moderate

Humidity

Low to moderate

Lifespan

Perennial

Native To

Central Asia

Toxicity

Toxic to pets if ingested

Planting

How to Grow

Tuck bulbs 4-6 inches deep in well-drained soil in fall.
Water thoroughly after planting to settle soil.
Mist foliage during dry spring weather for best blooms.
Allow foliage to yellow naturally after flowering for bulb health.
Divide overcrowded clumps every 3-4 years in early spring or fall.
Mulch with organic material to retain moisture and suppress weeds.

Pro Tip

Plant in full sun with well-drained soil for optimal growth and flowering.

Keep It Thriving

Care Guide

Do

Water during dry periods to keep soil slightly moist 🌱
Apply a balanced fertilizer in early spring
Allow foliage to die back naturally after blooming

Don't

Avoid overwatering to prevent bulb rot ❌
Do not disturb bulbs during flowering
Avoid planting in heavy, poorly-drained clay soils

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Fertilize
Plant

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Scented borderPerennial flower bedRock garden accent

Companion Plants

Lavender Rosemary Sedum Echinacea Salvia

Multiply

Propagation Methods

Good to Know

Common Questions

Persian Onion questions

What zones can Persian Onion grow in?

Persian Onion is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Persian Onion deer resistant?

Yes — Persian Onion is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Persian Onion bloom?

Persian Onion typically blooms in late spring through early summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Persian Onion need full sun?

Persian Onion does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Persian Onion drought tolerant?

Yes — once established (usually after the first full season), Persian Onion handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.