Grass trees epitomize the Australian bush: they’re beautiful, ancient, hardy, thrive in nutrient-poor soils and respond to wildfire by flowering profusely. They're iconic plants, recognisable even to budding botanists. They're all perennial, flowering plants. The smallest species grows to about 1m, others reach 6m tall. Most species are extremely slow growing. Studies of some of the taller species found that trunk height increases at about 0.8cm to 6cm per year, but this varies with local environmental conditions. In any event, grass trees are often very long-lived; some are estimated to be 350 to 450 years old.
www.bushheritage.org.au/speci...