Originally posted by ChocolateCat301:

Thanks people!

Originally posted by stvlepore:

You don’t need to change the land for trees, just plant them. Though it does look better cultivated.

I haven't ever been able to do that, I've tried, but thanks anyway.

I was not clear, you have to have the cultivator equipped to plant trees, but you do not have to use it to prepare the ground as you have to for carrots etc.