PL. —Wollemia nobilisBotanical illustration — drop image

Wollemi Pine

SpringSummerFallWinter

9a–11bHardiness zone

Background

Wollemia nobilis is a conifer known only from fossils until 1994, when a small wild population was found growing in sandstone gorges in Wollemi National Park, 150 km northwest of Sydney. Fewer than 100 mature trees exist in the wild. It belongs to Araucariaceae, a family tracing back to the Triassic, and is the sole species in its genus. For gardeners in zones 9–11, it is among the most historically significant specimen trees available in cultivation.

In gardens it is slow-growing, typically reaching 15–30 ft over many decades, though wild trees exceed 100 ft. The bark is dark and knobbly, widely compared to bubble wrap, and the foliage is flat and fern-like with a naturally tiered, layered habit. Trees are multi-stemmed and produce both male and female cones. Given shelter from desiccating wind, adequate drainage, and consistent moisture, Wollemi pines establish reliably across a range of garden soils. Container cultivation is viable for many years. In its native gorges, soils are sandstone-derived, acidic, and free-draining — replicating those conditions improves establishment.

The wild location was kept secret until 2000; seeds were released commercially in 2005 to reduce poaching pressure and ensure genetic material existed outside the single known wild site. Phytophthora root rot is among the primary documented biosecurity threats to the wild population, and access to the site remains restricted for that reason.

Good companions

Horsetail Ostrich Fern Sweet Woodruff Hellebore

Keep apart

Bindweed

Care guide

SunFull sun to part shade

WaterModerate

SoilMoist, well-drained, acidic

Spacing10–20 ft

Height15–30 ft

Zone9a – 11b

Seasonal tasks

winter

watchCheck soil moisture through winter in zone 9. Water during dry spells but avoid waterlogging. Protect young plants from temperatures below 25°F with horticultural fleece or temporary covering.

spring

watchMonitor new spring growth for color and vigor. Slow flushing, yellowing foliage, or wilting despite adequate soil moisture may indicate Phytophthora root rot — improve drainage and withhold irrigation until the soil dries.

sowIf planting in spring, do so after any frost risk has passed and before sustained temperatures exceed 85°F. In zones 9–11 this window falls in late winter to early spring.

summer

cutRemove dead or damaged stems cleanly at their base in late spring. The multi-stemmed habit is natural — do not reduce stem count unless a single-leader form is specifically intended.

watchDuring summer heat, ensure container-grown specimens do not dry out completely between waterings. Increase frequency but maintain free drainage — sitting in a saucer of water will cause decline.

fall

sowPlant container-grown specimens in fall in zones 9–11 to allow root establishment before summer heat. Choose a sheltered site with excellent drainage and no risk of standing water.

sowApply a 3–4 inch mulch layer over the root zone after planting, keeping mulch 6 inches away from the trunk base to reduce crown rot risk.

watchObserve cone development in fall: round female cones form on upper branches and elongated male cones on lower branches. Consistent cone production indicates a mature, established tree.

Common problems

Phytophthora Root Rot

Symptoms

Wilting despite moist soil, yellowing leaves, stunted growth, and dark, decayed roots and crown tissue. Vines may collapse during hot weather.

Treatment

Plant in well-draining soil and avoid waterlogging. Remove and destroy affected vines. Improve drainage with raised beds or amended soil and avoid overwatering.

Root rot

Symptoms

Plants wilt, yellow, and stunt even in moist soil; lower stems and roots turn brown, soft, and mushy and the plant may collapse. Most common in heavy, wet, or poorly drained ground.

Treatment

Improve drainage and stop overwatering, and never plant too deep. Lift and destroy badly affected plants along with the soil around the roots. Grow in raised or free-draining beds to prevent it returning.