I want to place some plants in the borders of my terrace garden. The house has a large amount of ivy running up the side of the terrace. When tilling the soil, I've discovered that it's completely full of tiny, fine roots, spreading out from the thicker ivy roots. I've cut out some of the clumps of fine roots and some of the thicker ones too that have grown throughout the soil. However, am aware that it will all rapidly grow back as the main source has been left untouched.

Is it possible to actually plant anything in this soil or will the profusion of ivy roots prevent anything from growing?