Eucalyptus: The World's Tallest Flowering Plants, Native to Australia

The tallest flowering plants on Earth are eucalypts (genus Eucalyptus), endemic to Australia. The champion species is Eucalyptus regnans (Mountain Ash / Swamp Gum), found in the cool, wet forests of Victoria and Tasmania.

Record Heights

• Current tallest living: "Centurion" in Tasmania—100.5 m (330 ft), discovered 2008 via LiDAR.
• Historical claims: "Ferguson Tree" (1880s, Victoria) alleged 132.6 m (435 ft)—unverified. "Allenvale Tree" (1930s) measured 89 m (292 ft).
• Reliable historical: 114 m (374 ft) for a felled tree in 1880s (Thorpdale, Vic)—if accurate, tallest plant ever recorded.

Why So Tall?

• Fire-adapted: Massive seed release after crown fire; rapid growth to outcompete.
• High rainfall (1,000–2,000 mm/yr), deep soils, mild temps.
• Efficient xylem structure; minimal heartwood.

Global Context

E. regnans is the tallest flowering plant (angiosperm). Only conifers (Coast Redwood, *Sequoia sempervirens*, 115.9 m) exceed it. Eucalypts planted globally (California, Spain, Portugal, Brazil, Ethiopia, India) rarely reach native heights due to different soils, pests, and climate.

Australia's eucalypt forests are carbon-dense, biodiversity-critical, and fire-prone—shaping the continent's ecology for millions of years.