Scientists revisited a forest experiment that lay forgotten for 30 years. What they found could reshape forestry debates. The Silvicultural Systems Project was set up in Victoria’s mountain ash forests between 1987 and 1989. It compared different logging methods across two sites. The options were clearfells, small patch clearfells and heavy thinning. In thinning, 50 to 70 per cent of trees were removed. Early results favoured clearfelling for regrowth. The site was then neglected for decades. When researchers returned in 2014, the thinned sections amazed them. The remaining trees had grown huge, over a metre thick. They were 20 per cent bigger than trees in untouched areas. The real shock was carbon. The thinned stands had stored as much or more carbon as the unharvested forest. They had fully recovered the carbon lost at harvest. Why does it matter? Bigger trees survive fires better. They also form hollows that endangered species like Leadbeater’s possum need. The lesson, researchers say, is that no single method fits every forest goal.