Carrs Bush is located within Fagan Park in the rural area of Hornsby Shire. The bushcare site is located in the north-eastern corner of the park, bounded by Carrs Road and Bayfield Road. The area drains into Still Creek, part of the Berowra Creek Catchment.

Fagan Park contains the largest remnant (around 7ha) of Sydney Turpentine-Ironbark Forest in Hornsby Shire.

Sydney Turpentine-Ironbark Forest is of national conservation significance and is listed as a critically Endangered Ecological Community under the Environment Protection and biodiversity Conservation Act (1999) and an Endangered Ecological Community under the Threatened Species Conservation Act (1995). Hornsby Shire has about 295 ha of this type of forest found mainly on private land, with Carrs Bush being one of the largest patches remaining.
Carrs Bush contains a relatively intact Turpentine-Ironbark Forest. However some areas do require a lot of work.
Turpentines (Syncarpia glomulifera) dominate the upper canopy but there are also smooth-barked apples (Angophora costata) and mahoganies (Eucaluptus acmenoides and Eucalyptus resinifera). The shrub layer is open and the ground layer is dominated by microlaena,
maidenhair fern (Adiantum aethiopicum) and rasp fern (Doodia aspera). Vegetation surveys have found over 100 native species including an endangered native heath plant (Epacris purpurascens var. purpurascens) and small-tongue orchid (Cryptostylis leptochilia).
Carrs Bush continues to be threatened by the encroachment and domination of the weed panic veldt grass (Ehrharta erecta). The volunteers and professional bush regeneration teams aim to stabilise previously worked areas to push the weed grasses to the edges. The ultimate aim is to reduce the impacts of weeds, particularly the weedy herbaceous layer and work from the good bush out. The vegetation of the site is relatively resilient and able to bounce back. With consistent work, the bushland can become more stable and more likely to regenerate without intervention.

 

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