Agapanthus Cool Steel™ ‘AG03’ – 50mm Tube

Agapanthus Cool Steel™ ‘AG03’ is a compact, long-flowering agapanthus producing large, rounded blue flower heads above neat, strap-like green foliage.

Flowering can begin during early spring and repeat through summer, extending the display beyond the flowering period of many traditional agapanthus varieties. Under suitable growing conditions, an established plant may produce up to 30 flower clusters.

Its compact growth, extended flowering and hardy nature make Cool Steel™ an excellent choice for garden borders, mass planting, pathways, pots and low-maintenance landscapes.

Supplied in a 50mm Tube

This product is supplied as a young live plant growing in a 50mm nursery tube.

The photographs show examples of mature, established plants. The plant supplied will be considerably smaller and may not be flowering when dispatched.

Flower Characteristics

• Dense, rounded blue flower heads
• Individual flower heads may reach approximately 20cm across
• Flower stems may reach approximately 65cm tall
• Begins flowering from early spring
• May repeat flower throughout summer
• Established plants may produce numerous flower clusters
• Flowers may attract bees, butterflies and other pollinating insects
• Suitable for cutting and floral arrangements

Flowering time, colour intensity and flower production will vary according to climate, plant maturity and growing conditions.

Key Features

• Compact clumping agapanthus
• Cultivar code ‘AG03’
• Neat, strap-like green foliage
• Foliage grows approximately 40cm high
• Mature spread of approximately 50cm
• Long spring-to-summer flowering period
• Tolerant of drought once established
• Good frost and humidity tolerance
• Suitable for full sun or part shade
• Performs in a wide range of soil types
• Useful for gardens, borders and containers

Suitable Uses

• Garden borders and edging
• Mass and mixed planting
• Pathways and driveways
• Low-maintenance gardens
• Cottage and contemporary gardens
• Dry and water-conscious gardens
• Courtyards and large containers
• Poolside and coastal-style landscapes
• Cut-flower gardens
• Pollinator-friendly planting

Mature Size

• Foliage height: Approximately 40cm
• Mature width: Approximately 50cm
• Flowering height: Up to approximately 65cm
• Flower-head diameter: Up to approximately 20cm

Final size will depend on climate, soil, available moisture and ongoing care.

Position and Soil

Plant in full sun to part shade. Stronger sunlight generally supports more abundant flowering, although protection from harsh afternoon sun may benefit plants in extremely hot climates.

Cool Steel™ tolerates soils ranging from sandy soil to heavier clay, provided excess water can drain away. Avoid permanently waterlogged positions.

Planting Guide

1. Water the plant before removing it from its tube.
2. Prepare a hole slightly wider than the root ball.
3. Carefully remove the plant without disturbing the roots excessively.
4. Plant at the same depth at which it was growing in the tube.
5. Backfill gently and firm the surrounding soil.
6. Water thoroughly after planting.
7. Apply mulch while keeping it clear of the plant’s crown.

For mass planting, allow approximately one to three plants per square metre or two to three plants per linear metre, depending on the desired coverage.

Watering and Care

Water regularly while the plant establishes its root system. Once established, Cool Steel™ has relatively low water requirements but will benefit from occasional deep watering during prolonged hot or dry conditions.

Apply compost or a suitable slow-release fertiliser during late winter or early spring. Remove spent flower stems to maintain a tidy appearance and prevent unwanted seed development.

Older clumps can be cut back every three to five years if the foliage becomes tired or untidy.

Safety and Responsible Planting

• Agapanthus can be harmful if eaten.
• Plant sap may irritate the skin and eyes.
• Wear gloves when dividing or cutting plants.
• Keep away from children and animals that may chew plants.
• Some councils classify certain agapanthus varieties as environmental weeds.
• Check local council guidance before planting near bushland, waterways or natural areas.
• Dispose of unwanted flowers and plant material responsibly.

Live Plant Notice

Plant size, leaf number, root development and overall appearance will vary naturally. Plants may be trimmed before dispatch and may not be flowering when supplied.

The photographs show examples of mature plants and are provided as a guide to the variety’s expected appearance.

Frequently Asked Questions

How large does Agapanthus Cool Steel™ grow?

The foliage generally reaches approximately 40cm high and 50cm wide. Flower stems can reach approximately 65cm tall.

When does it flower?

Cool Steel™ can begin flowering in early spring and may produce additional flowers throughout summer.

What colour are the flowers?

It produces dense, rounded heads of blue flowers. Colour intensity may vary slightly with light, climate and flower maturity.

Does it need full sun?

Full sun generally encourages the strongest flowering, although it also performs in part shade.

Is it drought tolerant?

Yes. It has good drought tolerance once established, but young plants require regular watering while developing their root systems.

Can it tolerate frost?

It has good frost tolerance. Young plants may still benefit from protection during severe frost while establishing.

Can it be grown in a pot?

Yes. Use a container with drainage holes and a quality, free-draining potting mix. Container-grown plants require more regular watering than plants growing in the ground.

Will the supplied plant be flowering?

Not necessarily. This product is supplied as a young plant in a 50mm tube. Flowering begins once the plant reaches sufficient maturity and suitable seasonal conditions occur.