Raised Bed Under Plum Tree?
I have a mature plum tree, underwhich I'd like to plant some winter/spring bulbs and perhaps have a few pots on the surface during the summer. My initial thought would be to build a small raised bed surrounding the trunk with say some gravel or wood chippings on top, but am cautious about doing this as don't want to damage the tree roots / trunk (that also need to breath?)
Also, I'll be installing some rasied veg beds nearby. With roots in mind, what would be a safe distance from the plum tree to do this?
Any advice appreciated.