How to detect if a tree is grown

Hi guys I am new to CCraft but am a fairly experienced programmer and I am trying to make a tree farm. The problem is I have code basically

if turtle.detect

chop tree until no more wood

go down to ground

go back one and plant

that is just pesudocode I have the actual save in a turtle anyway it detects a sapling as a block and that makes it continuously try to cut down the tree even though the sapling hasn't grown also there is turtle.compare which I tried to use but the doesn't seem to be turtle.compareForward just up and down so how can I detect if a sapling grows and not just a sapling

turtle.compare() checks the item in the currently selected slot against whatever's in front of the turtle; that's the "turtle.compareForward()" you're looking for.

If you don't know about it already, you may find the wiki very useful: http://computercraft...i/Category:APIs

if you scroll to the bottom of that page, you will get all of the APIs with links to function descriptions