Are Lilly Pilly Roots Invasive?
Lilly pilly roots are generally not considered highly invasive compared to other hedging plants. However, they still require adequate space from structures, paths, and pipes. With proper planting distance, lilly pilly is a reasonable choice for most gardens.
Quick take
- • Not highly invasive compared to alternatives
- • Allow 1.5–2m from foundations
- • AU scene: If you're on clay soil, focus on drainage and avoid 'wet feet'—mulch helps, but drainage matters more
- • Keep 1–1.5m from pipes and paving
- • Root spread mostly within drip line
Quick Definition
What it is
Lilly pilly refers to several Australian native plant species from the Syzygium, Waterhousea, and Acmena genera. These evergreen shrubs and trees are widely grown for hedges, screens, and ornamental features.
Spelling note
Some people spell it differently. This site uses "lilly pilly" consistently.
Best uses
- •Hedges and screens
- •Ornamental features
- •Native gardens
Native region & habitat
Native to Australia, found in rainforests, coastal areas, and moist gullies along the east coast.
Other common names
Brush cherry, Riberry, Weeping lilly pilly
Quick Care Snapshot
Root type
Modest spread
Tip: Not highly invasive
From house
1.5–2m min
Tip: 3m for large varieties
From pipes
1–1.5m min
Tip: More for old pipes
Root depth
Top 30–60cm
Tip: Mostly shallow
Quick Answer: Generally Safe With Space
Lilly pilly is not at the aggressive end of the root-invasiveness spectrum. Compared to plants like weeping willows, bamboo, or some ficus species, lilly pilly roots are relatively modest in their spread and impact.
What to do: Follow recommended planting distances from structures and infrastructure. Choose appropriate variety sizes for your space, and maintain regular pruning to control overall plant size.
Root System Overview
Lilly pilly develops a fibrous root system concentrated in the top 30–60cm of soil. Most feeding roots remain within the plant's drip line (the area under the outer edge of foliage). Some deeper anchor roots provide stability but are not typically problematic.
In hedge situations, root spread is naturally restricted by neighbouring plants. Specimen plants have more room for lateral expansion but still don't match the invasiveness of many alternative hedging species.
What to do: Improve soil at planting time to encourage healthy root development within the planting zone. This reduces incentive for roots to wander.
Safe Planting Distances
Use these minimum distances as a guide. Increase spacing for large varieties or in heavy clay soils where root expansion may be more pronounced.
| Structure | Minimum Distance | Notes |
|---|---|---|
| House foundations | 1.5–2m | 3m for large varieties |
| Sewer/stormwater pipes | 1–1.5m | More for old or fragile pipes |
| Concrete paths/driveways | 1–1.5m | Watch for lifting |
| Fences | 0.5–1m | Prune to reduce weight |
| Retaining walls | 1–1.5m | Avoid on top of walls |
| Pool edges | 3–4m | Also consider leaf/fruit drop |
What to do: If in doubt, allow more space. For specific concerns about infrastructure, consult relevant tradespeople (plumbers, engineers) for professional advice.
Comparison to Other Hedging Plants
Compared to common Australian hedging alternatives, lilly pilly sits in the moderate-to-low range for root invasiveness:
| Plant | Root Invasiveness | Notes |
|---|---|---|
| Lilly pilly | Low to moderate | Generally safe with spacing |
| Murraya | Low | Compact root system |
| Buxus | Very low | Shallow and contained |
| Photinia | Moderate | Similar to lilly pilly |
| Bamboo | High | Running types very invasive |
| Weeping willow | Very high | Aggressive water-seeking roots |
What to do: If minimal root impact is essential, consider lower-risk options like murraya or buxus. However, lilly pilly remains a reasonable choice for most situations with proper spacing.
Care Specifications
Quick reference for the essential care requirements of lilly pilly.
Root depth
30–60cm
Most roots in top soil layers
Root spread
To drip line
Contained by hedging
Invasiveness
Low–moderate
Not highly aggressive
From foundations
1.5–2m min
3m for large varieties
Frequently Asked Questions
Quick answers to common lilly pilly questions
Lilly pilly roots are generally not considered highly invasive compared to some other hedging plants. However, like most plants, they can affect paved surfaces if planted too close. Allow adequate space from structures.