karri pronounces ka-ree. Distribution and habitat Karri occurs only within the High Rainfall Zone of the South West Botanical Province of Western Australia which receives of rain per year, mostly in winter.<ref name=fpc>{{cite web|url=http://www.fpc.wa.gov.au/node/841|title=Karri Eucalyptus diversicolor|access-date=2 December 2017|publisher=Forest Products Commission}}</ref> It mostly occurs within the Warren biogeographic region, but there are some outlying populations including the Porongorup Ranges, Mount Manypeaks, Torbay, Rocky Gully all along the south coast and Karridale and Forest Grove to the north west and the Leeuwin-Naturaliste Ridge to the south of Margaret River to the west of the main belt. The heart of the karri forest is found near Nannup and Manjimup through to Denmark. The total area covered by karri forest is less than which is about one fifth of its virgin growth. The nearest tall tree forests are some to the east in Tasmania and Victoria. Ecology Some karri specimens are thought to reach an age of up to 300 years. The soil in which the species grows is often poor, and the tree tends to flower after fire to take advantage of the nutrients released by the combustion of forest litter. The soil is classified as karri loam. Though low in some minor nutrients it is admired for its depth and pasture-growing properties. The depth of the soil is several metres and thought to be created primarily from the bark shed by the tree, which collects at the trunk base to a depth upwards of six metres in mature trees. The karri supports an extensive ecosystem which is connected to the granite outcrops of the lower south-west and the many subsequent creeks and rivers created from runoff. Karri generally dominate in the deep valleys between granite outcrops surrounding the creeks and rivers. A dense understorey is found in karri forest areas which retains moisture over the hot summers. Associated trees and shrubs found in the understorey include the peppermint (Agonis flexuosa), karri sheoak (Allocasuarina decussata), karri wattle (Acacia pentadenia) and karri oak (Chorilaena quercifolia). A diverse assemblage of flowers and smaller plants – around 2,000 plant taxa – make up the mosaic of habitats within the karri forests. The species is considered invasive in South Africa where it is a problem in the Western Cape region and is locally known a karie. It commonly invades clearings, fynbos, water courses and road sides often out competing local species and is spread easily by seed