could we have a pic of the whole tree ..

could the lean have broken some roots???

could fertilizer been a reason for explosive growth.. or do you think it was finally 'established' and growing to specs??

ken

Oldest leaves falling off every year during the growing season (this timing is typical for broadleaf evergreens) should be expected. If this time it seems excessive then it will be likely to be soil moisture related. As in too much or not enough. Otherwise the same thing can also be the result of a soil mineral deficiency. In this latter case the old leaves being sacrificed in order to transport nutrients to recently matured new leaves that were produced at stem ends might be considered typical of this specific syndrome. With the aftermath being healthy looking leaves only near stem tips and a gaunt looking shrub interior.

Regarding the leaning over that probably indicates a rootbound condition in this instance. If bad enough the tree may go on to fail at some point, once the top is big and heavy enough to pull the entire specimen completely over. During such conditions as high winds after heavy rains. Or under snow loads where substantial snowfalls occur.