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Acmena smithii 'Forest Flame' - Lilly Pilly

About Your New Acmena smithii 'Forest Flame' - Lilly Pilly

Acmena smithii 'Forest Flame', now also classified as Syzygium smithii, is a dense, upright evergreen lilly pilly grown for its new growth. Each flush opens bright red to pink before hardening to glossy dark green. Clusters of small white flowers follow in summer, then pale berries that native birds take.

It grows in full sun to part shade in most soils with reasonable drainage, and responds well to feeding and steady water. Growth is moderate to fast and it clips readily from a young age. Naturally psyllid resistant, drought tolerant once established, and suited to subtropical, warm temperate and temperate coastal districts.

Most often used as a hedge or screen, planted 1 to 1.5 metres apart for an informal barrier or 80 centimetres apart for a tight formal hedge. It also stands alone as a feature or lines a driveway at 3 metres. The repeated colour flush makes an ordinary boundary worth looking at.

Frequently Asked Questions

About Forest Flame Lilly Pilly

What is Forest Flame Lilly Pilly?

Acmena smithii Forest Flame, now also classified as Syzygium smithii, is an Australian native evergreen shrub grown for its new growth. Each flush opens bright red to pink before hardening to glossy dark green, and the plant flushes several times through the warmer months. Small white flowers appear in summer, followed by pale berries.

How big does Forest Flame grow?

It reaches 4 to 5 metres in height and 2 to 3 metres across if left untrimmed, with a naturally upright, dense habit. As a clipped hedge it is easily held anywhere between 1.5 and 3 metres. The narrow width relative to height is what makes it useful along fence lines and boundaries.

How far apart should I plant Forest Flame for a hedge?

Plant 1 to 1.5 metres apart for a dense informal screen, or 80 centimetres apart for a tighter formal hedge that fills in faster. For an avenue or a row of individual specimens, allow 3 metres. Closer spacing brings the screen together sooner but calls for more water and feeding early on.

Is Forest Flame psyllid resistant?

Yes. Acmena smithii selections are naturally resistant to the psyllid that causes pimpled, distorted leaves on older Syzygium hedges, and Forest Flame holds clean foliage without spraying. This is the main reason it is chosen over older lilly pilly hedging in coastal and humid districts where psyllid pressure is high.

Does Forest Flame need sun or shade?

Full sun to part shade both work. Full sun gives the densest growth and the strongest red on new flushes. Part shade produces a looser plant with softer colour but still a serviceable screen. Deep shade is not suitable and leads to thin growth with bare lower stems over time.

Is Forest Flame suitable for coastal positions?

Yes, it handles coastal exposure well and is widely used in beachside gardens along the eastern seaboard. It tolerates salt laden wind, though in front line positions with direct salt spray it benefits from shelter behind an outer planting. Sandy coastal soils should be improved with compost before planting.

How do I prune and care for Forest Flame?

Trim two or three times through the growing season, taking the tips lightly rather than cutting hard, since each trim triggers a fresh coloured flush. Feed in spring and again in late summer with a native safe fertiliser low in phosphorus. Water regularly through the first year and mulch to keep the roots cool.

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Uses in my Garden

  • Screening or Privacy
  • Revegetation or Regeneration
  • Rural Property Planting
  • Council or Civic Landscapes

Acmena smithii 'Forest Flame' - Lilly Pilly works in an:

  • Australian Native Garden – celebrates local plants with natural character.
  • Formal Garden – structured, symmetrical design with clipped shapes.
  • Modern Garden – sleek, minimal, and design-led planting.
  • Low-maintenance Garden – resilient choices for easy care and year-round appeal.

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