Andrew Johnston Big Scrub Nature Reserve: A Protected Subtropical Rainforest Remnant in Northern New South Wales

Andrew Johnston is best known as the largest and most ecologically important surviving remnant of the Big Scrub, the almost entirely cleared subtropical lowland rainforest that once blanketed the lowlands around Lismore. The reserve is especially valued for its high diversity of rainforest trees within a very small land area, its large Moreton Bay figs, and its habitat for the uncommon marbled frogmouth.

The Big Scrub that once dominated the lowlands around Lismore was progressively cleared from the nineteenth century onward as settlers converted the deep volcanic soils to dairy pasture, cropping, and other agricultural uses. By the time conservation interest in these remnants matured, only a tiny fraction of the original forest remained, making each surviving patch, including Andrew Johnston, ecologically critical.

Andrew Johnston Big Scrub Nature Reserve was formally established in March 1993 and is now managed by the NSW National Parks and Wildlife Service as a habitat and species management area under IUCN category IV. Its protection recognized both the botanical richness of the site and the importance of preserving a meaningful example of the Big Scrub ecosystem for future scientific study and conservation.

The landscape of Andrew Johnston Big Scrub Nature Reserve is defined by lowland subtropical rainforest growing on deep, fertile basaltic soils. The terrain is generally gentle, sitting on the alluvial and volcanic lowlands of the Northern Rivers, but the underlying geology is the key to its character: red-brown soils derived from ancient basalt flows associated with Mount Warning and later volcanic activity from the Nightcap Range.

Rainfall is high, with average annual precipitation in the surrounding Lismore area of about 1,340 millimetres, producing the persistently moist conditions that allow tall emergent trees, layered understory vegetation, and a dense carpet of ferns and vines to flourish. Large Moreton Bay figs rise above the canopy in many places, giving parts of the reserve a particularly cathedral-like forest character. The adjacent farmland and pasture create a sharp visual contrast, making the reserve feel like a small forested island within an otherwise cleared agricultural landscape.

Andrew Johnston protects a representative example of Big Scrub subtropical lowland rainforest, an ecosystem distinguished by deep volcanic soils, high rainfall, and exceptional plant species richness. The vegetation is structurally complex, with tall canopy trees giving way to smaller trees, palms, shrubs, climbing vines, and a moist ground layer of ferns and leaf litter characteristic of mature subtropical rainforest.

More than 170 species of trees, shrubs, and vines have been recorded on the site, including white booyong, rosewood, long jack, red bean, koda, cudgerie, white cedar, and black bean. The canopy features prominent mature Moreton Bay figs, which contribute both to the structural diversity of the forest and to the habitat provided for birds and other animals. Because the ecosystem is naturally rare and heavily reduced, the floral richness packed into a small area is one of the defining features of the reserve.

The reserve's value for wildlife stems largely from the intact rainforest structure and the dense, fruit-bearing canopy of mature trees such as Moreton Bay figs. These conditions support a community of forest-dependent birds and other animals typically found in richer Big Scrub remnants.

A particular point of interest is the reserve's habitat for the marbled frogmouth, an elusive and seldom-seen rainforest bird that relies on dense, structurally complex subtropical forest. Such species give Andrew Johnston an importance for birdwatching and rainforest fauna conservation that extends well beyond its small footprint.

Andrew Johnston Big Scrub Nature Reserve was established specifically to protect a representative remnant of the Big Scrub, an ecosystem of which less than one percent survives today. By safeguarding a relatively large and botanically rich fragment, the reserve plays a significant role in preserving the genetic resources, plant communities, and ecological processes of a vanished regional rainforest system.

It is managed as an IUCN Category IV habitat and species management area, reflecting its focus on maintaining specific rainforest habitats and the species that depend on them. Because the surrounding land is largely cleared for agriculture, the reserve also serves as a refuge and potential source for rainforest species in the broader Northern Rivers landscape.

The reserve reflects a broader regional story of land clearing and rural transformation in the Northern Rivers. The Big Scrub was once a defining feature of the lowlands around Lismore, supplying timber and fueling early settlement, before being progressively converted to pasture and farmland. Andrew Johnston stands as a memorial to that lost landscape and as part of a community-led and government effort to retain meaningful rainforest remnants for future generations.

Andrew Johnston Big Scrub Nature Reserve's strongest points are its botanical diversity within a small area, its role as the largest and most important surviving Big Scrub remnant, and its value as habitat for elusive rainforest-dependent species such as the marbled frogmouth. The combination of basalt soils, high rainfall, complex rainforest structure, and prominent Moreton Bay figs gives the reserve an ecological character that punches well above its modest twenty-one-hectare footprint.

Andrew Johnston Big Scrub Nature Reserve is a humid subtropical rainforest site, so the cooler and drier months of late autumn, winter, and early spring generally offer the most comfortable conditions for walking and birdwatching, with less heat, fewer mosquitoes, and easier forest access. Summer brings lush growth and active birdlife but also higher temperatures, higher humidity, and greater insect activity. The reserve is a small, shaded rainforest patch that can be appreciated in most seasons, and visiting at calmer times of day increases the chances of observing shy forest birds such as the marbled frogmouth.