Talk:Lumberjack/@comment-5997873-20130118082536

Actually, it appears to affect everything in a radius of 8 squares around the core block. technically, this means a 17x17x17 block.

it will harvest wood and turn it into planks, and destroy leaf blocks, using the saplings generated to replant the trees.

Because it caps at 8 squares above itself, supertrees will often leave blocks of foliage behind if they are higher than 8 squares. To remedy this, you can place the lumberjack higher above the ground, up to 8 squares up, allowing it to reach the tops of taller trees.

Some items can be wiped out by spreading foliage, or can prevent the growth of certain types of trees with obstructions. Tree farming efficiency is discussed in greater detail on the minecraft forums.