Seems like it has thickened a hell of a lot faster than Peter Tea's 2 metre long branches which look like a similar thickness to your palmatum branch. How anyone can hold that it won't thicken faster if you leave more on is beyond me. But maybe I'm just going insane?
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I have been fiddling with this....
I have come to the conclusion that....
It depends!
First....I think its important to note that side branches on a sac in a wide canopy will shade out the tree...
I believe that is known, and...well..its a sacrifice...for the other foliage in some instances.
2...when are we taking side branches off?
A few of thousands of combinations ...
And remember...with thousands of dif trees...species...and individuals of species, there are a million possible outcomes!
When they are buds? Wax or wane?
When they are small branches? W or W.?
Big branches?
Leaves too or leave leaves?
Then it comes down to the individual tree for me....which...will then depend on one of thousands of possible health/weather/confusion/placement scenarios....
A sacrifice running into a shaded area may get thicker if just the tip tip is left.....
Or will it?
What if the maple is in shade shade and the sac is running to sun?
Shade?
Fugetaboutit...not even universities have enough space and time to make all these controls.
I remove the close side branches to keep the interior, or finished parts out of shade.
I can see how an extending tip only can lead to a thicker BRANCH..as I believe length = girth...which is good for base of branch thickness building...
But out of 8 sacs on my maple last year....
They all grew kinda different, one broke amd divided to 4. Some self divided.some with branches removed some not..blah...
No noticeable difs in thick at the base at all..
But here is the hidden kicker....
Where you are right...
I believe leaving all the foliage may not give you the VISUAL that is a thicker branch.
But that traffic WILL give you more healing on the trunk...more roots...more health...
The VISUAL is just harder to observe.
Sorce