Waterhousea floribunda: Weeping Lilly Pilly Size, Hedge and Growing Guide Australia
Waterhousea floribunda is called a Lilly Pilly, but it should not be planned like a compact suburban Syzygium australe hedge.
It is naturally a large eastern Australian rainforest tree, found along streams and riverbanks from northern New South Wales into Queensland. In the wild it can become a substantial tree, while garden plants are often maintained much smaller through site selection and pruning. NSW PlantNET describes it as a small-to-large tree of riverine rainforest, and the Australian Plants Society notes that natural specimens can reach around 30 metres.
Its appeal is easy to understand: dense evergreen foliage, long glossy leaves with softly wavy margins, white flowers, a graceful drooping canopy and enough vigour to form a substantial privacy screen.
The important question is therefore not simply:
“Is Waterhousea a good hedge?”
It is:
“Do I have enough room for the type of hedge or tree Waterhousea eventually wants to become?”
If you are still choosing between different Lilly Pillies, start with our Lilly Pilly hedge guide.
Quick Answer: What Is Waterhousea floribunda?
Waterhousea floribunda is an Australian evergreen rainforest tree commonly known as:
- Weeping Lilly Pilly
- Weeping Myrtle
- Weeping Lilli Pilli
NSW PlantNET retains the name Waterhousea floribunda and lists Syzygium floribundum as a synonym. Kew currently takes the opposite taxonomic treatment and accepts Syzygium floribundum, with Waterhousea floribunda as a synonym.
For Australian gardening purposes, Waterhousea floribunda remains the most useful name because that is still widely used by nurseries, landscape suppliers and NSW botanical references.
It is grown for:
- privacy screening
- large hedges
- windbreaks
- feature-tree use
- dense evergreen foliage
- the graceful weeping canopy
- native-garden structure
Waterhousea floribunda at a Glance
| Feature | Waterhousea floribunda |
|---|---|
| Common name | Weeping Lilly Pilly |
| Alternative botanical name | Syzygium floribundum |
| Plant type | Evergreen native tree |
| Natural height | Can reach around 30 m in habitat |
| Typical managed landscape size | Often around 4–10 m, depending on pruning and site |
| Habit | Dense, pendulous/weeping |
| Foliage | Glossy dark green, often wavy-edged |
| Flowers | Small white flowers in clusters |
| Fruit | Rounded green fruit developing reddish tones |
| Light | Full sun to part shade |
| Soil | Adaptable; best with useful moisture and drainage |
| Climate | Tropical, subtropical and warm temperate |
| Main garden uses | Screening, tall hedge, windbreak, feature tree |
Plantmark lists landscape plants around 4–10 m high and 4–10 m wide, while the Adelaide Botanic Gardens Plant Selector gives a more restrained cultivated reference of around 7–8 m high by 2.5–3 m wide. Natural rainforest trees can be much larger.
Is Waterhousea the Same as Syzygium floribundum?
Botanically, the two names refer to the same species under different taxonomic treatments.
NSW PlantNET currently uses:
- Waterhousea floribunda
and lists:
- Syzygium floribundum
as a synonym.
Kew’s Plants of the World Online currently accepts Syzygium floribundum and treats Waterhousea floribunda as a synonym.
Which name should Australian gardeners use?
Either may appear on a plant label.
For practical garden searching, nursery shopping and landscape planning, Waterhousea floribunda / Weeping Lilly Pilly remains extremely common in Australia.
Do not assume two plants are different species simply because one nursery says Waterhousea floribunda and another says Syzygium floribundum.
How Big Does Waterhousea floribunda Grow?
Potentially very large.
In its natural rainforest habitat, Waterhousea can reach about 30 metres. Plants of South Eastern New South Wales also records trees to around 30 m.
Garden plants are usually much smaller.
Plantmark lists approximately:
- 4–10 m high
- 4–10 m wide
for the species in landscaping, while the South Australian Plant Selector gives around:
- 7–8 m high
- 2.5–3 m wide.
Why are the size figures so different?
Because there is a major difference between:
- an unrestricted rainforest tree
- an open-grown landscape tree
- a regularly pruned screen
- a formal maintained hedge
- selected nursery forms
Pruning can control garden size, but it does not turn Waterhousea into a naturally dwarf plant.
Is Waterhousea Too Big for a Suburban Garden?
Sometimes.
This is the most important planning question for the species.
Waterhousea can work beautifully on:
- acreage
- large suburban blocks
- wide boundaries
- commercial landscapes
- parks
- substantial screening zones
It can become inconvenient where it is squeezed into:
- a very narrow side passage
- immediately beneath gutters
- directly against a fence with no maintenance access
- a tiny courtyard
- a shallow strip beside paving
- positions beneath powerlines
The existing Garden Green varieties guide already categorises Waterhousea as a choice for big spaces rather than small suburban gardens.
If your available hedge strip is compact, compare smaller Lilly Pilly options in our Lilly Pilly hedge guide.
What Does Weeping Lilly Pilly Look Like?
The foliage gives the tree much of its character.
NSW PlantNET describes leaves approximately 5.5–16 cm long, glossy dark green above and paler underneath, with pointed tips and undulating margins.
The branches and foliage develop a graceful pendulous effect, which is why it is called Weeping Lilly Pilly.
New growth can add colour
Selected nursery forms may produce pink or bronze new growth.
Australian Plants Society lists cultivated selections including:
- ‘ST1 Whisper’ — pink new growth
- ‘Amaroo’ — bronze new growth
- ‘Sweeper’ — strongly undulate foliage.
Those named selections should not be assumed to have identical final form to every seed-grown Waterhousea.
What Do Waterhousea Flowers and Fruit Look Like?
Waterhousea produces many small white flowers in branched clusters.
PlantNET records flowering in its natural NSW range around August to October, while nursery references may describe spring-to-summer flowering in cultivation.
The fruit is approximately 15–20 mm across, initially green and developing a reddish tinge as it matures.
Do not choose Waterhousea primarily for a spectacular flower display.
Its stronger landscape features are:
- foliage
- density
- canopy form
- scale
- screening ability
Is Waterhousea floribunda Good for a Hedge?
Yes — if you want a substantial hedge.
Plantmark specifically lists Waterhousea for:
- hedging
- screening
- dense barriers
- feature-tree use
and notes that it can maintain foliage to the base when managed appropriately.
This makes it particularly useful when the target is a tall privacy screen, not a small waist-high boundary.
What height can a Waterhousea hedge be maintained at?
Plantmark states that it can be maintained as a dense hedge around 4–5 m high.
That is already taller than many suburban hedges.
If your goal is a 1.5–2 m screen, Waterhousea may create far more pruning work than necessary.
For smaller hedge choices, use our Lilly Pilly hedge guide.
How Far Apart Should Waterhousea Be Planted for a Hedge?
Plantmark gives about 1.5 m spacing for hedge planting as an indicative commercial landscape recommendation.
Do not treat that number as mandatory in every garden.
Spacing should also reflect:
- starting plant size
- selected form
- intended hedge height
- how quickly closure is required
- available width
- access for future pruning
- soil and climate
Planting much closer simply to create instant density can increase competition and future maintenance.
This page owns Waterhousea-specific planning. For the broader hedge-selection process, use the Lilly Pilly hedge guide.
Can Waterhousea Be Pleached?
Yes.
Plantmark specifically notes that Waterhousea can be pleached, meaning the lower stems are cleared while the canopy is maintained above, creating screening at a higher level.
This can be useful where you want:
- privacy above a fence
- clear access beneath the canopy
- a tree-screen effect
- visibility at ground level
Pleaching is different from forcing the whole plant into a narrow hedge.
The trunk and canopy still require room to mature.
How Fast Does Waterhousea Grow?
It is generally considered a vigorous or fast-growing landscape tree under suitable conditions.
Gardening with Angus lists it as fast-growing, and its natural riverine-rainforest origin helps explain why good moisture supports strong growth.
Do not turn that into an unsupported fixed metres-per-year claim.
Actual growth depends on:
- climate
- soil moisture
- root space
- light
- establishment
- starting plant size
- nutrition
- pruning frequency
For a hedge, lateral density matters just as much as height.
Where Does Waterhousea Grow Naturally?
It is native to eastern Australia.
NSW PlantNET records it as widespread in riverine rainforest, often lining stream banks, from around the Hunter Valley northwards and into Queensland.
Australian Plants Society describes the natural range extending through northern NSW and Queensland, typically along creeks and rivers.
That habitat gives an important cultivation clue:
Waterhousea is not naturally a dryland hedge plant.
Does Waterhousea Need Full Sun?
It performs in full sun to part shade.
Plantmark and the South Australian Plant Selector both list full sun and semi/part shade.
For a dense hedge, useful light generally supports stronger foliage density.
Part shade can still work, particularly in warmer climates.
Avoid assuming that “rainforest tree” means it wants a permanently dark garden position.
What Soil Does Waterhousea Prefer?
Waterhousea is reasonably adaptable but naturally associated with moist alluvial and riverine environments.
Plantmark lists loam and sandy soils, while the South Australian Plant Selector records clay, loam and sand across a broad pH range.
Moist does not mean stagnant
The species appreciates reliable moisture, particularly while establishing.
But a garden should still allow roots to function.
A constantly waterlogged compacted planting hole is different from the aerated moist soils of a natural stream margin.
How Often Should Waterhousea Be Watered?
Use the root zone and weather, not a fixed calendar.
Gardening with Angus describes Waterhousea as performing best with good regular watering, while tolerating some dry periods. The South Australian Plant Selector also notes that extra water may be needed during dry conditions.
Newly planted trees
Avoid repeated severe drying while roots are establishing.
Established plants
Water need depends on:
- rainfall
- heat
- soil depth
- wind
- root competition
- hedge density
A mature tree in deep soil has different water needs from a newly planted hedge beside reflective paving.
Is Waterhousea Drought Tolerant?
To a degree once established, but it should not be treated like a dry-climate shrub.
The South Australian Plant Selector lists drought tolerance, while Gardening with Angus says established plants can tolerate some dry spells. Both also emphasise useful moisture or supplementary watering.
Its natural habitat remains an important clue: riverine rainforest and stream margins.
For dry, low-water sites, another screening species may be a more natural fit.
Does Waterhousea Tolerate Frost?
Light frost may be tolerated.
Gardening with Angus lists light-frost tolerance, while the South Australian Plant Selector lists moderate frost tolerance.
That does not make it equivalent to a cold-climate deciduous hedge.
Young trees and exposed sites can still be more vulnerable.
Microclimate matters.
Can Waterhousea Grow in Melbourne?
It can grow beyond its natural northern NSW/Queensland range in suitable cultivated conditions.
Royal Botanic Gardens Victoria has recorded Waterhousea floribunda in its Melbourne and Cranbourne living collections, including botanist-verified specimens.
That demonstrates cultivation is possible, but it does not prove every exposed Melbourne suburban garden provides ideal conditions.
In cooler areas, favour:
- protected positions
- adequate establishment water
- reasonable sun
- shelter from severe cold exposure
Does Waterhousea Get Lilly Pilly Psyllid?
It can be affected by psyllids.
Gardening with Angus specifically notes psyllid damage causing pimpling of the foliage.
Do not market Waterhousea as automatically psyllid-proof.
If the plant has distorted, bubbled new foliage, sticky leaves, black sooty growth or general decline, diagnose the symptom rather than treating blindly.
Use our Lilly Pilly problems guide for the broader troubleshooting process.
Does Waterhousea Need Regular Pruning?
If used as a formal hedge, yes.
A naturally large tree maintained at hedge dimensions requires ongoing pruning.
Pruning can:
- maintain density
- control height
- keep foliage clear of paths
- shape the screen
- maintain a pleached form
The South Australian Plant Selector notes that pruning can maintain shape and encourage thicker foliage.
Do not forget what the plant wants to become
A 4–10 m landscape tree being held at 2 m is a different maintenance proposition from planting a naturally compact Lilly Pilly cultivar.
Choose the plant to suit the long-term target, not just the appearance of the nursery pot.
Waterhousea or Syzygium australe: Which Is Better for a Hedge?
Neither is universally better.
They suit different spaces.
Choose Waterhousea when you need:
- a tall screen
- broad-scale privacy
- acreage or a large boundary
- a weeping canopy
- eventual tree-scale presence
- a hedge potentially maintained around 4–5 m
Choose Syzygium australe when you want:
- more cultivar choices
- compact and medium hedge options
- easier control in typical suburban gardens
- specific psyllid-tolerant selections
- a smaller long-term footprint
For Syzygium australe growing and care, use our Syzygium australe guide.
For cultivar selection across different hedge sizes, use our Syzygium australe varieties guide.
Frequently Asked Questions
How tall does Waterhousea floribunda grow?
In natural rainforest habitat it can reach about 30 metres, but managed landscape plants are commonly listed around 4–10 metres. Pruning can keep a hedge smaller, but the species is naturally a substantial tree.
Is Waterhousea floribunda the same as Syzygium floribundum?
They refer to the same species under different taxonomic treatments. NSW PlantNET retains Waterhousea floribunda, while Kew currently accepts Syzygium floribundum.
Is Weeping Lilly Pilly good for hedging?
Yes, particularly for tall screens and substantial boundaries. Plantmark notes that it can be maintained as a dense hedge around 4–5 m high.
How far apart should Waterhousea be planted for a hedge?
Plantmark gives about 1.5 m as an indicative hedge spacing. Final spacing should also consider plant size, selected form, target height, available width and maintenance access.
Does Waterhousea grow fast?
It is generally regarded as fast-growing under favourable conditions, particularly where warmth, root space and useful moisture are available. Avoid relying on a fixed metres-per-year promise.
Can Waterhousea grow in Melbourne?
Yes, cultivated specimens occur at Royal Botanic Gardens Victoria in Melbourne and Cranbourne. Protected garden conditions are preferable to severe exposed frost.
Does Waterhousea tolerate frost?
Established plants can tolerate some frost, with Australian horticultural references listing light to moderate frost tolerance. Young plants and exposed sites may be more vulnerable.
Does Waterhousea get psyllids?
It can. Psyllid damage may cause pimpled or distorted foliage, so Waterhousea should not be promoted as automatically psyllid-resistant.
Can Waterhousea be pleached?
Yes. Waterhousea can be trained with clear lower trunks and a maintained canopy above, which is useful when privacy is required at fence height or higher.
Is Waterhousea suitable for a small garden?
Usually only with careful planning and ongoing pruning. It is naturally a large tree, so compact Lilly Pilly cultivars are often more practical where space is genuinely limited.
Final Thoughts
Waterhousea floribunda is an excellent screening tree when its natural scale matches the property.
It offers:
- evergreen privacy
- dense foliage
- an attractive weeping habit
- white flowers
- native wildlife value
- strong screening potential
- the option of hedging or pleaching
But its strengths become liabilities when it is squeezed into a narrow suburban strip.
Natural trees can become enormous, while managed landscape plants are still commonly several metres high and wide.
Choose Waterhousea when you genuinely need a large, vigorous screen.
If you are choosing a smaller suburban hedge, continue to our Lilly Pilly hedge guide.
For broader Syzygium australe planting and care, use our Syzygium australe guide.
