The Andrew Johnston Big Scrub Nature Reserve is a protected nature reserve in the Northern Rivers region of New South Wales, Australia. A subtropical jungle remnant of the Big Scrub, the 21 ha reserve is approximately 19 km northeast of. Far less than 1% of the original Big Scrub now remains.

Features

The Reserve's red-brown soil is derived from a basaltic flow from the nearby Mount Warning, and later volcanic flows from the Nightcap Range. Average annual rainfall at Lismore is 1340 mm. The Reserve is the largest and most important of the remnants of the Big Scrub. The area previously known as "Big Scrub Flora Reserve" is larger; however, it is not considered part of the genuine Big Scrub further to the south. Over 170 species of trees, shrubs and vines have been recorded at this reserve. Significant rainforest tree species include white booyong, rosewood, long jack, red bean, koda, cudgerie, white cedar and black bean. As at most of the Big Scrub remnants, large Moreton Bay figs are prominent at this reserve. It is also a habitat for the seldom seen marbled frogmouth.