Your score is 1pt per tree that you grow and remains standing at the end of each round. Last for as many rounds as the server specifies.
The AI could be coded to attack the trees in any method possible. There is no points awarded for killing the enemy, all weapons have to be crafted and each round gets incrementally harder.
There would be some tactical element to this as players could wall in a "garden" but the Ai could send Creepers to knock down walls and such forth.
It also allows breathing room ( only a tiny bit) for the survivors as they wont be having to defend their fort, only themselves and trees. Also for those having ideas of moating off the "garden": The bigger your Garden the more likely the enemy spawn inside.
The last twist: Your own trees wont drop Seedlings. You have to venture out into the wild to harvest from natural trees. Once the natural trees run out, well lets just hope you saved some seeds..... >:smile.gif: