Planting acorns makes trees, their wood and their acorns a renewable and farmable resource. The Terraria wiki page for Trees has great info about how to plant them.
I'm wondering how they grow.
I planted a dozen or so in a spaced-out row and was quite surprised to see one of these suddenly sprout into a tree around three times the character height (~9 blocks). Other planted acorns haven't grown for several in-game days. I'm not sure whether other trees have grown or not. I suspect not.
Two related questions:
- How long does it take for a planted acorn to become a tree that may be harvested for wood and/or acorns?
- Do trees grow more over time? (If I wait to chop a tree, will it grow taller?)
Best Answer
It takes a somewhat random amount of time for trees to grow once they are planted. Assuming that all the growth conditions are met (as detailed on the wiki page you posted), it can take anywhere between 30 seconds to 5 minutes, in my experience.
Once a tree has grown, it will not get any taller, and it will not grow any additional branches. If you cut part of the tree down (or cut branches off), it will not regrow those parts.