Signs a tree needs an arborist in Dianella
- Leaves dropping suddenly, or new leaves failing to appear in season.
- Shoots sprouting straight from the trunk or main branches, called epicormic growth.
- A banksia, gum or grass-tree browning off fast, which can point to Phytophthora dieback in the roots.
- Small round holes with sawdust-like frass, gumming or white crystalline foam on the bark, possible signs of shot-hole borer.
- Dead branches piling up underneath, or the ground lifting around the base on a windy day.
Tree health in Dianella
Phytophthora dieback attacks roots. In WA's south-west, over 40 per cent of native plant species are susceptible, banksias, eucalypts and grass-trees among them, along with plenty of garden plants. Once the roots are badly infected, the whole plant dies.
It travels in soil, water and roots, and people moving infested soil have spread it further and faster than anything else. So ask anyone working near bushland to arrive with clean tools and tyres, and don't bring in soil or mulch from unknown places.
If you suspect the borer instead, report it to the Exotic Plant Pest Hotline or through MyPestGuide before anything is cut.
Arborists in Dianella: what's local
Two significant natural areas
The City of Stirling lists Cottonwood Crescent Nature Reserve and Dianella Regional Open Space as Dianella's regionally significant and Bush Forever areas. Cottonwood is the smaller reserve, known for native wildflowers in spring and cared for with a Friends group.
Sand that held back farming
Dianella is named after a small blue lily, and its banksia sandplain soil was long thought too poor to farm. Housing took off in the 1960s, spreading north from Walter Road and Grand Promenade.
Lots of small parks
Besides the two big areas, Dianella has two community open spaces and 65 small parks. The regional open space sits where Alexander and Morley Drives meet.
Tree pruning and lopping in Dianella
Stirling put Dianella North and South at 11.2% canopy and added both to its 2026 Themed Avenues list. More than 650 trees went in across the suburb in the 2026 planting season.
You can help them along: a deep watering once a week in mid-summer, and no parking on the verge, which compacts the roots. If a verge tree looks unwell, ask the City to inspect it rather than pruning it yourself; only the City may prune street trees.
Trees and power lines in Dianella
If a tree has brought down a power line, assume it's live, keep at least 8 metres away and call Western Power. Call 000 if anyone is hurt. A tree tangled in wires is the network's job, not yours or an arborist's.
Hiring an arborist in Dianella
If a native tree is going downhill, we'd have an arborist diagnose it before deciding anything, because dieback, borers and plain old age need different answers. We'd ask them to clean their gear, keep soil from leaving the site and tell us where the wood goes. If it does need to come down, ask the City first and read our WA permits page.