Low-Allergy Trees and Shrubs Suited to Canberra Backyards

Canberra has one of the highest rates of hay fever in Australia, and the trees and shrubs in your own backyard can be a major contributor. Choosing the right species when planting can make a real difference to allergy sufferers in the household.

Why Some Plants Trigger Allergies and Others Don’t

The key difference comes down to how a plant spreads its pollen. Wind-pollinated species release huge volumes of small, lightweight pollen designed to travel on the breeze, since they have no other way to reach another plant. This airborne pollen is what triggers hay fever and asthma symptoms. Insect and bird-pollinated species, on the other hand, produce heavier, stickier pollen that’s carried directly by the animals visiting their flowers. It rarely becomes airborne in quantities large enough to cause a reaction, which is why brightly flowered plants are generally a safer choice for allergy-prone gardens.

Camellias are pollinated by birds or insects

Top 10 Low-Allergy Choices for Canberra Backyards

All of the following are insect- or bird-pollinated, suit Canberra’s climate, and work well as backyard trees or large shrubs:

1. Banksia marginata (Silver Banksia) – native, frost hardy, attracts nectar-feeding birds
2. Callistemon (Bottlebrush) – native, frost hardy once established, reliable flowering
3. Melaleuca (Honey-myrtle) – native, compact, minimal litter
4. Correa (Native Fuchsia) – native shrub, frost hardy, shade tolerant
5. Grevillea – native, wide range of frost-hardy cultivars, long flowering
6. Camellia – exotic evergreen shrub, shade tolerant, reliable winter flowers
7. Crepe Myrtle (Lagerstroemia) – deciduous, frost hardy, drought tolerant once established
8. Magnolia – exotic, showy spring flowers, low allergen risk
9. Photinia – evergreen, commonly used as a screening shrub or small tree
10. Viburnum – evergreen or deciduous depending on variety, reliable hedging or specimen shrub

Top 10 Allergy Offenders

These are common wind-pollinated trees and shrubs found in Canberra gardens and streets, several of which are known to contribute to the region’s pollen season:

1. Cypress and cypress pine – one of the earliest and most intense pollen sources in Canberra, with extreme pollen days recorded from mid-August
2. Pine – releases large volumes of pollen through late winter
3. Birch – a significant, well-documented hay fever trigger
4. Oak – pollinates in September alongside birch and plane trees
5. Plane tree – a widely planted shade and street tree, and a major spring pollen contributor
6. Ash – pollinates in late winter, often overlapping with cypress
7. Liquidambar – a well-known hay fever trigger, commonly sold in nurseries
8. Poplar – releases pollen through late winter into spring
9. Privet – a common hedging shrub; highly allergenic when in flower
10. Wattle (Acacia species) – one of the few widely-grown natives that is wind-pollinated and a genuine allergen, unlike most other Australian natives

A Few Practical Notes

No garden can be entirely pollen-free, since airborne pollen also travels in from surrounding streets and reserves. But replacing high-allergen species on your own property, particularly cypress, birch, and privet, removes a source of pollen at close range, which is where exposure matters most.