For not knowing your soil type...in ideal 'world'..I would mix into planting hole and in back filling soil quite a bit grit, garden compost/leafmould and/or peat and good few handfuls of bone meal.
You are going to plant it in challenging place (near hedge) where there is already 'fight' going on with nutrients, so little addition into planting hole is needed to keep your young tree fighting chance, but that's it.
In a spring, should you tree show signs of new growth or not...you know if you need to add anything else to really give it a boost. Then good mulch and blood, fish and bone meal (or bit of chicken pellets) is what would 'boost' the new growth.
At this stage..your tree will need to get over the first 'hurdle'= getting over the chock of new 'surroundings' around its 'toes'..then it have to 'decide' if it is happy and wants to settle in..and once spring comes, if it has survived and still 'happy', it will want to grow.