Leonardo da Vinci has some things to say about this :
All the branches of a tree at every stage of its height when put together are equal in
thickness to the trunk below them.
and this :
Every year when the boughs of a plant [or tree] have made an end of maturing their growth, they will have made, when put together, a thickness equal to that of the main stem; and at every stage of its ramification you will find the thickness of the said main stem.
Towards the end of the season we will see - if this is correct i will get some lovely results. Several of my trees have increased hugely in ramification this year already. The Oak is as usual is leading the pack - but the maples are looking strong too. I wonder if the defoliation and doubling of fine twigs on the maples will have an effect. So much still to learn.