how can i stimulate leaf growth on my oak tree?

Question

the core is green but no leaf growth

Answer 1

This may seem rather backward, but if you were to apply a "growth inhibitor" to the tree system it will limit leaf production and encourage root system growth. This in turn will create a stronger tree overall, and the future leaf and branch production will be greater.
And I quote:
"...application of a growth inhibitor that was applied to the tree in 2003. This product basically forces the tree to redirect a good deal of the tree’s energy into root growth, versus leaf growth. This treatment has the opposite effects, and goal, of a fertilizer application. Whereas fertilizers typically promote rapid leaf growth, growth inhibitors encourage root growth. This large oak tree needs to, and is now spending most of its’ energy growing new nutrient absorbing roots, allowing the tree to store up food reserves that will be required for future “above ground” growth, such as leaves and twigs. The effects of the applied growth regulator should be evident for a few years, eventually giving way to more “above ground” growth."
Happy Yardening!

Answer 2

An oak is a thirsty tree it has been quite dry of late. also if it is a recent purchase it takes time to settle in and will need plenty of feed to but remember an oak this I know to my peril have 100 years or more to mature and believe me when I say that the big trees are expensive they need a lot of managing and as they grow you loose your what was friendly neighbours.

Answer 3

try putting honey on yhe branches, this attracts bees,butterflys ect, wich will help pollenate the buds hence new leaf growth