Xanthorrhoea - Black Boy Tree

$11,500.00

Tax included. Shipping calculated at checkout.

Size: 500L (single head)

500L (single head) 500L (double head)

All stock is grown, maintained and graded in strict accordance with AS 4373-2007, Australian Standard for Nursery Stock.

Current Stock Height Guides

500L: Enquire within for height guide information.

Height guide disclaimer: Height ranges are approximate only. As living products, plant heights naturally vary between individual plants, batches, and seasons. No guarantee is given that supplied plants will fall within the stated range. If minimum heights are required, you mustconfirm current batch heights with Evergreen Trees Direct prior to purchase. Variation in height is normal and is not grounds for return, refund, replacement, or compensation.

Mature Height & Width

Mature Height: 1m - 6m Approximately (variable depending on species, very slow-growing; this refers to trunk height)

Mature Width: 1 m – 3 m (leaf crown spread)

Xanthorrhoea - Black Boy Tree is expected to grow Approx. 1 – 3 cm/year (Very Slow).

Root Ball Dimensions (Height & Width)

Use this as a reference when digging your planting hole. We recommend digging at least 10% wider than the dimensions below to encourage strong root development.

30cm Pot: 33cm (W) × 30cm (D)
40cm/45L Pot: 44cm (W) × 41.5cm (D)
50cm Pot / 70L Pot: 55cm (W) × 41.8cm (D)
100L Bag: 50.6cm (W) × 52.8cm (D)
150L Bag: 66cm (W) × 55cm (D)
200L Bag: 71.5cm (W) × 60.5cm (D)
300L Bag: 88cm (W) × 63.8cm (D)
400L Bag: 99cm (W) × 66cm (D)
500L Bag: 122cm (W) × 66cm (D)
750L Bag: 134cm (W) × 69cm (D)
1000L Bag: 146.3cm (W) × 71.5cm (D)
2000L Bag: 176cm (W) × 82.5cm (D)

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Shipping Cost

Shipping is calculated at checkout based on the pallet space your order occupies in the truck and your delivery location.

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Contact Us

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Email: sales@evergreentrees.com.au

Phone: (03) 7042 3318

VOLUME DISCOUNTS

10% off orders over $1,000
15% off orders over $2,000
20% off orders over $7,500

Discounts Apply Automatically At Checkout

About Your New Xanthorrhoea - Black Boy Tree

Xanthorrhoea species, commonly known as Grass Trees or Black Boy Tree, look excellent when used as striking focal points in native and xeriscape gardens. Their thick, woody trunks topped with dense tufts of grass-like foliage add a sculptural, architectural element that commands attention. The dramatic flower spikes, reaching up to 2 meters, attract nectar-feeding birds and insects, enhancing garden biodiversity.

These evergreen plants tolerate poor soils, drought, and fire, thriving in full sun with minimal maintenance once established. They are perfect for low-water gardens and rockeries. For added landscape impact, Grass Trees can be underplanted with low-growing native shrubs or succulents, creating a layered effect and varied texture that complements their bold form.

Enriched Planting Mix (AO Certified)

$21.95

Features and Benefits

Organically certified product
Improves aeration for roots
A rich blend of Pure Magic Compost, composted animal manure, Gypsum, composted coarse bark and wetting agent
Excellent to mix with heavy clay soils, an organic mixture with added gypsum which is perfect for exotic plants
Revitalises tired soils, adds nutrient and organic matter, no chemical additives, weed free
Assists in retaining moisture in the soil longer after rain or watering

Directions For Use

Water plant well at least several hours prior to planting.
Dig a hole at least twice the width of the pot and 7cm deeper than the pot.
Mix Grow Better Enriched Planting Mix with the soil that has been dug out of the hole, adding about 1/3 planting mix.
Spread a 7cm layer of improved soil in the hole and remove plant from the pot. Tease roots gently if the root ball is very firm and place plant in the planting hole. Check that pot soil is level with the surrounding soil surface level, not higher or lower.
Fill in the hole with improved soil mixture, firm down soil and water well adding Grow Better Plant Starter to final watering.

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Type:

Enriched Planting Mix (AO Certified)

$21.95

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Uses in my Garden

Council or Civic Landscapes
Plant in Pots (or) Suitable for Pots
Feature Tree

Xanthorrhoea - Black Boy Tree works in an:

Australian Native Garden – celebrates local plants with natural character.
Contemporary / Architectural Garden – striking forms for bold design statements.
Coastal Garden – relaxed, seaside feel with hardy, textural plants.
Low-maintenance Garden – resilient choices for easy care and year-round appeal.

Is Xanthorrhoea - Black Boy Tree Evergreen or Deciduous?

Xanthorrhoea - Black Boy Tree is an Evergreen (foliage year round) Tree

Mature Height & Width

Mature Height: 1m - 6m Approximately (variable depending on species, very slow-growing; this refers to trunk height)

Mature Width: 1 m – 3 m (leaf crown spread)

Xanthorrhoea - Black Boy Tree is expected to grow Approx. 1 – 3 cm/year (Very Slow).

Growth Rate of Xanthorrhoea - Black Boy Tree

Xanthorrhoea - Black Boy Tree is expected to grow Approx. 1 – 3 cm/year (Very Slow).

They are considered to have a:

Slow Growth Rate

Frost Tolerance & Ideal Climate to plant Xanthorrhoea - Black Boy Tree

Is Xanthorrhoea - Black Boy Tree frost tolerant?

Xanthorrhoea - Black Boy Tree is Frost Hardy – Survives heavy and frequent frost without damage.

Does Xanthorrhoea - Black Boy Tree Flower?

Xanthorrhoea produces dramatic, upright flowering spikes covered in thousands of small cream-white flowers rich in nectar. These blooms often follow fire, seasonal changes or periods of stress, creating a striking architectural feature that rises well above the foliage.

Does Xanthorrhoea - Black Boy Tree flower?

Yes - Flowers

Flowering Period:

Sporadic

Flower Type:

Pollinator-attracting

Flower Colour:

White

Is Xanthorrhoea - Black Boy Tree an Australian Native Tree?

Yes

Xanthorrhoea - Black Boy Tree is Native to Australia – different species occur across much of the continent. They are commonly found in heathlands, open forests, and rocky slopes.

What is the Wildlife Value of Xanthorrhoea - Black Boy Tree ?

Its tall flowering spikes produce abundant nectar that attracts native bees, beetles and beneficial insects, while also drawing in nectar-feeding birds such as honeyeaters. The dense skirt of older foliage at the base provides sheltered habitat for small reptiles and ground-dwelling wildlife, supporting a diverse and resilient ecosystem.

How much Sunlight does Xanthorrhoea - Black Boy Tree need?

Xanthorrhoea - Black Boy Tree will thrive best in:

Full Sun
Part Shade

Preferred Soil?

Xanthorrhoea performs best in very well-drained sandy or loamy soils with an acidic to neutral pH. It will not tolerate heavy, compacted or waterlogged soils, and these must be avoided or significantly improved with coarse materials to enhance drainage. Keep the soil lightly moist during establishment, then gradually reduce watering as it develops its natural drought resilience. Avoid disturbing the root system at all stages.

Is Xanthorrhoea - Black Boy Tree Drought Tolerant?

Is Xanthorrhoea - Black Boy Tree Drought tolerant?

As a young plant it benefits from careful, regular watering while ensuring the crown stays dry. Once established, Xanthorrhoea shows excellent drought tolerance, thriving in hot, dry environments and maintaining its form with little to no supplementary watering.

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How To Plant Your Xanthorrhoea - Black Boy Tree

Planting Your Grass Tree:

Select the Right Site: Full sun with excellent drainage is crucial for healthy growth.
Prepare the Soil: Loosen the soil and ensure it is free-draining. Consider raising the planting area to improve drainage if necessary.
Planting: Plant at the same depth it was in the container. Avoid burying the trunk any deeper than it was previously.
Backfill: Use the same soil removed from the hole, no fertilizers are required at planting.
Water Thoroughly: Water in after planting, but ensure not to waterlog the soil.

Recommended Planting Spacing For Your Xanthorrhoea - Black Boy Tree

Hedging & Screening: Not suitable for hedging

Feature Plant: Plant 2 m – 3 m apart to allow space for the spreading crown

Landscape Grouping: Plant in clusters with low shrubs or open mulch for sculptural effect

Xanthorrhoea - Black Boy Tree is expected to grow Approx. 1 – 3 cm/year (Very Slow).

Slow Growth Rate

Long Term Care For Your Xanthorrhoea - Black Boy Tree

Caring For Your Grass Tree:

Watering: Be cautious with watering; overwatering can kill the plant. Once established, rainwater is often enough.
Pruning: Minimal pruning is required. Old foliage can be trimmed to tidy up the plant if desired.
Fertilizing: Generally not required. If necessary, use a slow-release low-phosphorus native plant fertilizer.
Monitoring: Watch for signs of rot at the base which can indicate overwatering. Ensure good air flow around the plant.
Protection: Grass Trees are very hardy but can be affected by extreme frost. Use frost cloth to protect if necessary.

By following these guidelines, your Xanthorrhoea should thrive, adding a uniquely Australian character to your garden for many years, possibly centuries.

Planting Your Xanthorrhoea - Black Boy Tree in Different Soil

How to Grow Grass Trees in Different Soil Types

Grass Trees require excellent drainage.

Here’s how to manage different soils:

Ideal. Minimal preparation required.

Not suitable unless modified. Improve drainage by raising the planting area and incorporating coarse sand or gravel.

Suitable, provided water doesn’t pool. Create a mound if needed.

Acceptable if well-draining. Dig wide enough to accommodate root mass.

Avoid wet, boggy, or compacted areas. Raised beds or mounded plantings are strongly recommended for problematic sites.

Frequently Asked Questions

Frequently Asked Questions:

Q: How fast do Grass Trees grow?
A: Growth is extremely slow, often only a few centimeters per year.

Q: When is the best time to plant Grass Trees?
A: Plant in the cooler months, allowing time to establish before the heat of summer.

Q: How much water does my Grass Tree need?
A: Initially, weekly watering is beneficial. Once established, Grass Trees require very little water.

Q: Can I plant Grass Trees in a shaded area?
A: They prefer full sun but can tolerate partial shade, although growth may be even slower.

Q: When will my Grass Tree flower?
A: Flowering can take many years; some specimens won’t flower until they are at least 20 years old.

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Xanthorrhoea - Black Boy Tree