Warwick Bushland covers an area of approximately 60 hectares and is one of the City of Joondalup’s top five Major Conservation Areas due to its high biodiversity values. It is also designated a Bush Forever Site (No. 202) in the Government of Western Australia’s conservation plan Bush Forever, published in 2000. Much of the native vegetation on site is in very good or excellent condition. Ecological surveys have identified 225 native flora species, hundreds of native fungi, 3 or more native mammals, over 64 native birds, 16 native reptiles, 2 native amphibians and thousands of native insects, spiders and scorpions (see lists). Local species of special conservation value due to declining populations include three insects, the Graceful Sun-moth, Scion Skipper and Western Jewel Butterfly, as well as three Cockatoo species (Focus Topic 10). Warwick Bushland is also an important refuge for 11 orchid species that are now rare in Perth.

Warwick Bushland is a prime example of banksia and jarrah woodland dominated by banksia species with a scattered overstory of jarrah, tuart and some marri. This regionally significant vegetation consists predominantly of Candle Banksia (Banksia attenuata) and Jarrah (Eucalyptus marginata) open woodland, with Menzies Banksia (Banksia menziesii) and scattered Sheoak (Allocasuarina fraseriana), Tuart (Eucalyptus gomphocephala) and Marri (Corymbia calophylla) trees. It is situated within the Spearwood Dune system, which is around 40,000 years old and comprised of red/brown, yellow and pale yellow/grey sands. Warwick Bushland is on the eastern side of the Spearwood Dunes in the Karrakatta – Central and South Vegetation Complex. Due to the limited remaining extent of this Vegetation Complex, it is important to retain all remaining vegetation within Warwick Bushland to meet Bush Forever conservation targets. Detailed information about this Bush Forever Reference Site is available online.

Perth is one of only a handful of major cities in the world where there are locally endemic species (found nowhere else) that are threatened by habitat loss and climate change. The Jarrah-Banksia Woodlands throughout Warwick Conservation Reserve are in a Threatened Ecological Community that is recognised by the Commonwealth government. They are also an important part of the international effort to protect the most diverse and threatened places on the planet because Southwestern Australia is also one of the 35 key Global Biodiversity Hotspots.