*Agonis flexuosa* — known as WA Peppermint or Willow Myrtle — is one of the most recognisable trees in Perth. It’s planted as a street tree, a backyard shade tree, a parkland specimen. It’s been a fixture of WA gardens for decades.
You cannot buy it through treebate.com.au.
That’s worth explaining properly, because it’s not a simple compliance rule. It’s a judgment call — and an honest one means showing our reasoning, not just the conclusion.
Why Agonis Flexuosa Is Excluded From treebate.com.au
Treebate’s official eligibility test is straightforward: an Australian native tree reaching at least 3 metres at maturity, purchased from a WA commercial nursery, with a valid tax invoice and a photo of the plant label. There’s no government-published list of excluded species, and nothing in the program’s published eligibility rules singles out Agonis flexuosa.
So when we say we won’t sell it, we’re not relaying a government restriction. We’re applying our own, stricter one.
What DPIRD’s Data Actually Says
DPIRD’s WA Host List for Polyphagous Shot-Hole Borer rates Agonis flexuosa as **Negligible** — the lowest susceptibility tier the list records, one step below Low. It’s classified as a Non-Reproductive Host: PSHB may attack it, but cannot establish breeding galleries inside it, and DPIRD’s own documentation states these trees are not generally expected to die from infestation.
By the numbers, it’s one of the safer species on the entire list — safer, in fact, than Bull Banksia or Acorn Banksia, both of which we sell without restriction. This isn’t a case of excluding an obviously high-risk species. It’s a case of applying a more cautious line than the data alone would require.
Why the Industry’s View Has Shifted
As recently as August 2025, Agonis flexuosa was being actively recommended as a flagship Treebate purchase by parts of the WA nursery industry — alongside Corymbia ficifolia, which carries a genuinely higher PSHB risk rating (High Reproductive Host). At that point, PSHB management in WA was in an earlier phase, before the Management Zone and Containment Zone system was introduced in November 2025 with stricter movement and planting controls tied to confirmed infestation density.
Corymbia ficifolia’s current hard-stop status in the Management Zone is a straightforward read of that updated data — high susceptibility, active infestation zone. Agonis flexuosa’s rating didn’t change in that restructure. It’s still Negligible. We still don’t sell it.
Why We Hold the Line Anyway
Three things, together, are why this is a permanent exclusion rather than a zone-by-zone judgment call.
**The susceptibility index is a guide, not a guarantee.** DPIRD’s own documentation says as much — ratings reflect confirmed detections to date, and species can move between tiers as more infestations are recorded. A Negligible rating today describes what’s been confirmed so far, not a permanent ceiling.
**Agonis flexuosa is everywhere.** It’s one of the most widely planted trees in the Perth metro area. A species already this common is one where even a small shift in its risk profile has an outsized effect on the total infestation surface across the city, simply because there’s so much more of it in the ground than almost anything else we’d otherwise recommend.
**A blocked sale costs us nothing. A wrong one costs the city a generation of canopy.** If our caution turns out to be unnecessary, the cost is a customer plants a Bull Banksia or a Tuart instead — both excellent, fully PSHB-clear trees, no real loss. If a precaution turns out to have mattered and we hadn’t applied it, the cost is contributing to exactly the kind of citywide infestation pressure the entire PSHB response exists to prevent.
That asymmetry is the whole policy. We’re not claiming DPIRD’s rating is wrong. We’re recognising that our job — making sure every tree we sell holds up under a standard stricter than the minimum required — is a different job to the one a general eligibility rule is built to do.
If You Already Have One — Or Were About to Buy One
If Agonis flexuosa is already growing on your property, this changes nothing for you. A Negligible rating means no elevated removal recommendation and no special monitoring beyond the standard PSHB vigilance every WA property owner should already practise — watch for bore holes, frass, or staining, and report anything suspicious via the MyPestGuide Reporter app or DPIRD PaDIS on (08) 9368 3080.
If you were planning to buy one for your Treebate claim, we’d point you toward a species with a comparable look and habit and zero PSHB ambiguity at all. Our Tree Selection Tool covers the full range of confirmed-safe alternatives for your specific suburb and garden size.
*PSHB susceptibility data sourced from DPIRD WA Host List Version 6, 30 June 2025. Treebate eligibility requirements verified against the official DWER Treebate page. Industry context sourced from ArbWest, “WA’s TREEBATE Program is Here!” (21 August 2025). PSHB zone restructure dated to the 14 November 2025 DPIRD Transition to Management announcement. treebate.com.au is an independent guide and is not affiliated with DWER, DPIRD, or the WA Government. This article describes treebate.com.au’s own internal policy and is not a claim about the official risk rating of Agonis flexuosa beyond what DPIRD has published.*