Once-upon-a-time – nearly 30 years ago to be more precise – a lone eucalypt seedling taught me an important lesson. The seedling was part of a major research project I was undertaking in Canberra, Australia on the response of eucalypts to fire. I had planted the seedling on a north-facing slope (which receives the most sunlight in the southern hemisphere) and it was growing much better than other seedlings nearby. Why was this so? The answer was a surprise. If I hadn’t had access to specialist equipment, I probably would still be wondering. It turned out that the interplay between fire, water and light was critical to the impressive growth of this seedling, as well as affecting the 1000 or so eucalypt trees I monitored for 18 months after the fire. Learning more about the inner-workings of these incredible plants reinforced the inter-connectedness of everything, and opened the door to further post-fire studies in Malibu, California. Looking back, it is safe to say this one eucalypt seedling changed the course of my life.