Hiya
The larger trees need zero weed maintance once out. Now if you main goal with the
apple trees was the
apple crop then it would probably be of benefit to kill the grass.
Planting out big trees has its pros and cons.
Cons: a lot of digging to get them out, need a digger if they are planted densely.
Pro: once you add the protective pipe you are done, great satisfaction knowing that they are safe. Also very visually pleasing once they sprout the following year.
BUT you have to prune them very hard. Basically pollarding the oaks. This can be hard to do as it feels 'wrong' to take a lovely big tree and chop the top off, but it will Improve it's survival rate hugely and once it sprouts in spring you will have a lovely looking tree.
If I was doing it again i would be planting all my seed in small pots and then once the tree is a foot or so tall plant it outside in ridges.
I plant a massive amount of seed into buckets. Any
bucket I find that has a crack automatically becomes a pot for trees. A lot of the oaks I am.planting out are 10/11/12 years old, but all you need is a bit of height, I have planted out apple trees at 3/4 years old and they are just as protected once the pipe goes on.
This year I will be planting the trees in the pictures out into ridges.
The rides current have bigger trees which I am.planting out into their final place. I am going to dig up the ridge and space the trees around 2 feet from each other so that eventually I will be able to dig them.up with the spade, and I will use news paper as a weed barrier.