Why your lilly pilly has gone bumpy, brown or bare at the bottom.
The most planted screening hedge in the Shire, and the one people ring us about most. Almost every lilly pilly problem comes down to one of three things — a sap-sucking insect, a hedge that’s been cut only on the outside for years, or a plant that’s hungry.
- Growth rate
- Fast — roughly 0.5–1m a year while young
- Trim
- 2–3 times a year; monthly tips for a formal face
- Hard reduction
- Yes — reshoots readily from bare wood
- Flowers
- Fluffy white, spring into early summer, then berries
The short version
If the new leaves are pimpled and puckered, that’s lilly pilly psyllid — a tiny native sap-sucker. The damage is cosmetic, but it is permanent on the leaves it has hit. Those leaves will never flatten out again, so the fix is a hard cut in late winter to remove them and let the plant flush clean into spring. Spraying leaves that are already damaged does nothing.
How fast it actually grows
A young lilly pilly puts on somewhere between half a metre and a metre a year in good Shire conditions, which is why it fills a boundary fast and why it gets away from people just as fast. Planted at a metre apart, most varieties close into a solid screen inside two to three years.
That speed is the whole reason it needs cutting two or three times a year rather than once. A single annual trim on a plant growing at this rate means you are always cutting off a year’s worth of growth at once — which is a reduction job, at reduction prices, every single year.
How often to cut it
Through the warm months, from about September to March, it will take a light trim every four to six weeks if you want a crisp formal face. For a normal screening hedge that just needs to look tidy, two to three cuts across the year is plenty: one in early spring, one mid-summer, one going into autumn.
Through winter, leave it alone. Growth slows right down and cutting on a summer schedule through the cold is money spent on nothing.
The hard reduction — and why it looks worse before it looks better
This is the good news about lilly pilly: it reshoots from old wood. You can take one back well past the green shell into bare stems and it will push new growth from those stems, usually within four to six weeks in the warmer part of the year.
The right time for a hard cut is late winter, roughly August in Sydney. Cut then and the plant reshoots straight into the spring growth flush, which is when it has the most energy to rebuild. It looks confronting for about a month. Then it thickens up from lower down instead of only at the tips, which is the entire point.
The one thing worth being honest about: a very old, very neglected hedge that has been surface-trimmed for a decade may have almost no living wood on the inside. Those ones can be staged over two seasons instead — a third off, let it reflush, then the rest. We’ll tell you which one yours is before we start.
Cuts back hard and comes back thickerWhat a healthy one looks like — and what it looks like when it isn’t
Most people can tell something is off but not what. This is the quick read.
Doing well
- New growth flushes bronze, copper or red before hardening to green
- Leaves lie flat and glossy with no raised bumps
- Foliage carries right down to the base of the plant, not just the top third
- Fluffy white flowers in spring, followed by pink or purple berries
Telling you something
- Pimpled, puckered new leaves — psyllid
- Bare, twiggy bottom third with all the green up top
- Pale, washed-out yellowish leaves across the whole plant — usually hungry
- Black sooty film on the leaves — scale insects feeding above it
The four things people ring us about
Bumpy, pimpled leaves
Lilly pilly psyllid, a native sap-sucking insect that attacks the soft new growth. It is ugly rather than fatal.
What to do: The damage on an affected leaf is permanent, so treatment is really removal. Cut the damaged growth off in a late-winter reduction and let it flush clean. If you are planting new, ask the nursery for a psyllid-resistant selection — Resilience, Straight and Narrow and Backyard Bliss are the ones usually named.
Bare at the bottom, thick on top
Almost always a pruning shape problem, not a health problem. If the hedge has been cut with straight or inward-leaning sides, the top shades the bottom and the lower foliage dies off.
What to do: Cut the hedge slightly wider at the base than the top so light reaches the whole face, and take the dead wood out of the middle. On a lilly pilly this is recoverable — a hard reduction resets it.
Pale or yellowish all over
Usually nutrient shortage, and it shows up faster in the sandy soils common through Cronulla, Woolooware and Kurnell, which do not hold onto fertiliser.
What to do: Feed with a controlled-release native or general shrub fertiliser in early spring and again in late summer, and mulch to hold moisture. Consistent water matters as much as the feed.
Black film on the leaves
Sooty mould. It is a fungus growing on the sugary honeydew that scale insects or aphids excrete, so it is a symptom, not the disease.
What to do: Deal with the scale and the mould stops being fed. It weathers off over following months. Opening the plant up with a proper trim helps, because scale thrives in dense, still, shaded growth.
What to feed it
A controlled-release fertiliser suited to natives or general shrubs, applied in early spring and again in late summer. On the sandy soils around the beaches, mulch matters as much as the fertiliser — it stops both water and nutrients washing straight through.
The year, in this climate
Timings below are for Sydney’s south. Everything shifts a couple of weeks either way depending on the season you get.
| When | What | Why |
|---|---|---|
| Late winter (Aug) | The reduction, if it needs one | Cut hard now and it reshoots straight into the spring flush, with the whole growing season ahead of it to rebuild. |
| Early spring (Sep) | Feed, mulch, first trim | The main growth flush starts. Feeding now is the single highest-value thing you can do for it all year. |
| Summer (Dec–Feb) | Trim every 4–6 weeks if formal | Fastest growth of the year. Water through dry stretches — stress here shows up as leaf drop later. |
| Autumn (Mar–May) | Last trim, second feed | Tidy it going into the cold so it holds shape through winter without needing to be touched. |
Written from what we see week to week on hedges around the Sutherland Shire, cross-checked against Australian horticultural sources. Every garden is different — aspect, soil and how the plant has been treated in the past all change the answer. If yours does not match what is described here, send us a photo and we will tell you what we think is going on.
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