Posted: 04/01/2014 at 17:05
Scots pines aren't as bad as yew. They tend to drop their bottom branches in time and don't have such a heavy leaf cover.
Honesty grows under my pines. Euphorbia robbiae grew under the yew for a while but there's nothing to speak of now. Try those and the ones Dove suggested and see how you get on.
If you can raise the canopy, ie chop off the bottom branches, your chances are greater but you still have dry and rooty to deal with so don't waste time and money on standard sun-loving perennials.