lilies and stonecrop do pretty well in acidic soil. lily of the valley thrives under my pine. if you tell her to mix in some organic mix, that should take some of the edge out of the soil. some hostas should be able to survive too. we have a bleeding heart on the edge of our pine's radius - it does very well.

The soil pH will not be affected by the plants are growing on it. Popular garden myths include pine needles acidifying soil. Under my pines (with quite alkaline soil) I grow hosta, daylillies, actea, epimidium, astilbe, ligularia, pulminaria, ferns, brunnera & oakleaf hydrangea to name a few.

tj