Planting trees in chalk

I would like to plant some 5ft holly trees in an area of my garden. When I started to dig holes for them, I discovered that the ground consists of pure chalk - there appears to be no topsoil at all. I could add top soil/compost etc when I plant the trees, but will this ground hinder the growth of the holly? Does anyone have any suggestions? Many thanks.

 

http://www.gardenerscorner.co.uk/forum/showthread.php/planting-holly-chalk-23278.html?t=23278

 

Preparing the planting holes in the way that you suggest will be fine.

I worked in Winchester for many years and it's perched on top of hills which are solid chalk. It had many fine, mature trees of all types and the new plantings were doing well too, provided they had plenty of water in the early stages.