Know the best month for each species to keep trees healthy & safe.

Perth’s blazing summers, mild winters and sandy soils create unique growth cycles. Prune at the wrong time and you risk disease, sun-scald or a surprise fine from your local council. Our ISA-certified arborists distilled ten years of climb data into this seasonal guide, so you can time every cut for maximum tree health—and minimum stress on your green (and bank) balance.

Why timing matters

• Sap flow & energy reserves – Trees heal fastest when carbohydrates aren’t tied up in new foliage.
• Pest pressure – Borers and polyphagous shot-hole borer are most active in late summer. Fresh wounds = free buffet.
• Council regulations – Some suburbs restrict pruning during nesting season (Aug–Oct). Always lodge a notice for heritage trees—see our Arborist Services Perth page for help.

Three arborist tips to stay legal & safe

• Measure before you cut – WA regs treat any cut >20 % canopy as “major works.” Get council approval first.
• Disinfect between trees – 70 % ethanol wipe prevents Phytophthora dieback spread.
• Anchor or hire – DIY ladders cause 34 % of pruning injuries (WA Health 2024). For limbs over 3 m high, book a pro—read why DIY tree work can cost you more.

Signs your tree needs immediate attention

• Visible crack or “v” union
• Mushroom shelf at the trunk base
• Branches rubbing power lines (call Western Power first)
• Sudden lean >15 ° after winter storms

Urgent trims fall outside seasonal windows—safety first, calendar second.