root trimming

Not this time of year. You shouldn't be repotting now.
Unless you are just slip potting. Then you just lift the existing roots,dirt and all,put in a bigger pot and fill around it.
I wouldn't even do that.
 
Do I need to trimm the roots still if I'm putting my trees in bigger pots when I repot them ?

It's very health dependant.

From the looks of the soil and stories and such.....I'd go SAFE.

Generally....your want to take a bit more off of heavy roots, to keep them in proportion, and every time you have a tree out, especially in the beginning, you should work on root placement, and getting a good start to your surface roots.

However, I would be easy this year.

One thing Walter Pall says is, people take too many roots off too fast.

It does slow em down.

Remember to take pics at repot if possible, maybe grab a helper, it really is good practice to have pics of that which you can not look at for a year, but still have to be aware of!

Sorce
 
Not this time of year. You shouldn't be repotting now.
Unless you are just slip potting. Then you just lift the existing roots,dirt and all,put in a bigger pot and fill around it.
I wouldn't even do that.
I'm not doing it now I'm doing it in spring
 
Don't need to cut the roots in the spring if you are upping pot sizes.
Especially if you plan on growing something out.
 
Actually, I would say that you need to take advantage of every re-pot to improve the rootage, even if the tree is still in the grow out stage. Cutting back heavy surface roots and removing downward growing roots early on is essential to developing a balanced, ramified nebari. Don't wait until the trunk is done growing to work the roots...you'll be sorry.
 
Just to add to what @Dav4 said:
You should at least loosen the roots from the surface of the root 'ball' when transferring to a larger pot. Otherwise the roots tend to keep orbiting the tree and not grow into the added soil/medium.
 
Just to add to what @Dav4 said:
You should at least loosen the roots from the surface of the root 'ball' when transferring to a larger pot. Otherwise the roots tend to keep orbiting the tree and not grow into the added soil/medium.
Belated thought:
With a tree in development, I would (as @Dav4 urges) also trim those loosened roots back to the surface of the root ball. The soil added around the original ball will insulate the new root growth to a certain extent, even though the roots won't be quite as cold hardy if you were to do this at this time of the year.
 
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