Think of plants as highly optimized competitors for resources, and you’ll get a long distance. (It’s true that we are discovering just how much plants support one another, too, but there is definitely a competition, too.)
When a forest fire strikes, plants that were excluded from the light, water and soil nutrients suddenly have a big chance. If they can grow quickly, they might even stop the trees from growing back. The very fastest growing plants are rarely the largest or most resilient, though. Once bushes have gotten a short distance upward, they’ve reached their limit.
That’s where the slower growing plants get an edge. There may still be some sun and light and nutrients available, especially if the bushes don’t like certain spots. After more time passes, these fast-growing grees start to get an edge over the bushes. Eventually, because they can grow higher, they start to “win”. That’s what a pine tree might do.
But there are other players in the forest, including trees that are bigger and have more fire resistence. Eventually they may in turn overshadow the pines, in the same way the pines shadowed shorter plants.
So basically growing speed is a part of any plant’s survival tactic. Some plants grow very fast just to be finished with a year when the first freezes come. I.e., they are taking advantage of a scarce resource. Others grow fast in competition.
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