In Boundless, trees are currently very static, and never change unless people cut them down. I think it would be interesting to make trees dynamic, so they grow, change, make seeds, and die, and may even be cultivated. People could build whole empires based on tree farming! Another thing you could do is give the trees a genetic code. They could have different genes that encode for branch size, leaf color, fruit type, etc. However all of this would cause a lot of lag, and would be very hard to handle. Maybe dynamic trees could be artificial and made with gleam, spark, and oort, and be reserved for more powerful, higher class players.
This feature would also be a doorway to other features. People could use artificial selection to create new varieties of trees, and then sell their seeds. There could be different sprays you could craft that would change your trees, such as dwarfing sprays, branching sprays, flowering sprays, etc.