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Library > Bulbs > Allium

Plant profile

Allium

Frost: Frost HardyHardiness: HardyType: Perennial

Best month to plant in Melbourne (AU Zone 5): April

It's currently Autumn in Melbourne; perfect time to prep your allium bed.

Vital Stats

Sowing depth: 8-10 cm

Spacing: 12-15 cm

Sun: Full Sun

Water: Low to moderate, drought tolerant once established

Growth Cycle

Germination: 21-35 days

Maturity: 180-220 days

Companions: Lavender, Salvia, Catmint

Climate-Specific Warnings

Local Climate Note

Guidance is tuned to Melbourne (AU Zone 5). Keep drainage, airflow, and frost timing aligned with current seasonal conditions.

Cheat Sheet

Sun

Full Sun

Water

Low to moderate, drought tolerant once established

Soil pH

6.5-7.5

Pro Tip

Leave spent seed heads standing to add winter structure and feed birds.

Popular Cultivars

Early flowering selections: Help extend bloom windows at the front of the season.
Large-flower selections: Usually need richer feeding and support in exposed gardens.

Nearby Natives: Perfect for Your Local Soil

Zone 5 logic is active for your location, so these native plants are prioritized for resilient local performance.

Kangaroo Paw

Anigozanthos flavidus

Grevillea

Grevillea rosmarinifolia

Lomandra

Lomandra longifolia

How to Plant

Plant bulbs in well-drained soil with neck at or just above soil line.
Choose open spots with at least 6 hours of sun.
Mulch lightly to reduce weeds while keeping crowns dry.

Ongoing Care

Water only during prolonged dry periods.
Avoid high-nitrogen feeds that soften stems.
Divide crowded clumps every few years.

Troubleshooting Pests

Onion thrips: trim damaged foliage and keep airflow high.
Mildew: space plants wider and water in the morning.
Bulb rot: remove affected bulbs and refresh drainage.

Seasonality Bar (Melbourne context)

Toggle between yearly month-grid planning and a compact timeline with stage-specific tasks.

SowGrowHarvestCurrent month marker

Sow

Grow

Harvest

May focus (current month)

Sow

Direct sow at about 8-10 cm depth and keep topsoil evenly moist during establishment. Keep light and airflow consistent in Melbourne.

Climate Logic

Give bulbs a cool-root start, then steady light for strong flower stems.

Best month by AU/NZ band

Temperate: April
Mediterranean: May
Subtropical: June
Tropical: July
Cool: September

Advanced Climate Logic

Live BOM Soil Moisture Percentile

Live BOM signal is currently unavailable. Continue using the baseline guidance below.

Melbourne Microclimates

Coastal Melbourne sites (for example St Kilda) are usually milder overnight; use lighter mulch (3-4 cm) to avoid keeping root zones too cool and wet.
In colder inland valleys (for example Yarra Valley), frost hangs longer; use thicker mulch (6-8 cm through winter) and in frost-prone pockets, direct sow around 0.5 cm deeper for root buffering.

La Nina / El Nino Adjustments

When BOM flags a wetter La Nina phase, hold back supplemental watering and monitor for waterlogging in heavier soils.
When BOM flags a drier El Nino phase, add protective mulch and use occasional deep soaks instead of frequent shallow watering.

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