How high could the trees grow with the gravity of Mars?

We don't know how high trees could grow on Mars because we don't know what the limiting factors are. read more

Saying trees would grow 60% taller because of lower gravity isn’t a bad guess but it is still a guess. In the short term there is on limiting factor we know will restrict how tall a tree can grow, the height of our habitats. If the ceiling it 2 m high that is how tall the tree can grow before it destroys the habitat. read more

So trees could grow significantly taller in a low-g environment compared to standard gravity, although there would still be other limiting physical factors in place. In a high-g environment trees would likely evolve to better hold on to the ground using an extensive root system, and have shorter and more massive trunks. read more

In “The Martian,” Mark Watney uses the Martian soil to grow potatoes in the controlled environment of the “Hab.” In reality, the soil on Mars has the nutrients plants would need to survive on Mars. read more