I recently planted a 2m (6.5ft) high relatively young Pinus pinea in zone 8a (−12.2 °C, 10 °F). It is going well so far. I tried to find out what plants I should grow in its vicinity that would help the pine be stronger and healthier. I searched the internet, and there is a lot of information on plants that thrive under pines, but not on plants that help pines.
Are there any such plants?