PBR

Agapanthus Cool Steel™ 140MM

Agapanthus hybrid 'AG03' 'Cool Steel™'

I am Agapanthus Cool Steel™. My family originated from southern Africa.

Habit Strappy - Long flowering window

Plant family Amaryllidaceae

I am a compact clumping perennial that produces dense, ball-shaped blue flower heads up to 200mm in diameter. My blooms are prolific from spring to summer, with up to 30 large flower clusters per plant that are a magnet for butterflies and bees. I am a great option for dry gardens or tropical gardens in a cooler climate. Hardy I cope well with disease and am drought, frost and humidity tolerant. I grow best in a full to part sun position. Deadhead my flowers to maintain my tidy appearance. To keep me looking good, apply a slow release fertiliser in spring and cut my foliage every 3-5 years.

Caution: Harmful if eaten. Skin and eye irritant. Weed note: Some councils list all Agapanthus as weeds. This variety isn't named on their lists. Other councils recommend it, so check your own council's list. See Council planting lists below for growing tips.

I am popular and will make you happy because...

I have striking blue flower umbels in spring and summer

My attractive flowers are also a magnet for butterflies and bees

Hardy I am drought, frost and humidity tolerant

Features

Ideal light: Full Sun to Part ShadeI thrive in full sun to part shade

Height: 0.4m Width: 0.65m(Size at point of sale approx. 45cm including pot)

Water needs: Low (once established)I need little water once established

I thrive in most soil types

Frost tolerance: High

Plant features

Cut flowers Coastal tolerant Blue flowers Green foliage Flowers Jan-Feb, Sep-Dec

Council planting lists

On council planting lists

Listed in these NSW councils' published plant lists.

Wagga Wagga City Council
Recommended for landscape plans: Landscape guidelines: recommended plant species (listed as Agapanthus spp., which covers the whole genus) Source

On council weed lists

Councils that list all Agapanthus

These lists cover every Agapanthus, without naming particular varieties.

Campbelltown City Council
Weed / do not plant: Verge Development Guide (2022): plants to avoid (listed as Agapanthus spp.) Source
City of Kingston
Weed / do not plant: Invasive plant species (weeds) (listed as Agapanthus spp.) Source
Knox City Council
Weed / do not plant: Landscape Plan Guidelines: environmental weeds (do not plant) (listed as Agapanthus spp.) Source
Merri-bek City Council
Weed / do not plant: Gardens for Wildlife guide: common weed species (listed as Agapanthus spp.) Source
City of Monash
Weed / do not plant: Weeds (listed as Agapanthus spp.) Source
Murrindindi Shire Council
Weed / do not plant: Invasive Plants in your Patch (listed as Agapanthus spp.) Source
City of Prospect
Weed / do not plant: Plants not approved for verge use (listed as Agapanthus spp.) Source

If you'd like to grow it

Cut off spent flower stems before the seed heads ripen, so seed can't spread.
Put seed heads, fruit and cuttings in the green waste bin, not the home compost.
Never dump garden waste in bushland, parks or near creeks.
It is lower risk in town gardens, courtyards and pots well away from bushland and waterways. Avoid planting it on properties that border bushland, creeks or farmland.

If you're unsure, ask your local council before planting, especially on a property next to bushland.

From each council's website, checked 27 Oct 2026. Councils update their lists from time to time, so check the source before planting on council land or for a planning permit. Find your council's lists

Plant me:

In garden beds and general landscaping
In pots and other containers

Tips for success

Deadhead my flowers to maintain my tidy appearance

Suggested spacing: 0.3m apart.

Full Sun to Part Shade (4+ hours of direct sun)

Once established, check soil moisture and water during extended dry periods.

Planting & care

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Ask your retailer for Agapanthus Cool Steel™ by Southern Plants. Our plants are available through Bunnings, good retail nurseries, or via landscapers. We do not sell direct to the public. Availability in individual stores varies; contact your retailer before visiting.

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