Can plants be planted in the holes of large old trees?
I am researching ways to landscape around the infamously difficult yet beautiful California Pepper tree. I read on another website that someone described seeing a Cal. Pepper in which someone had planted various Monocot type flowers growing out of holes or crevasses in the tree. Before I go causing harm to this ancient pepper tree and spending money I wanted to make sure this was something I could do.
I anticipate some warnings about the pepper tree's acidity being to much but if so, out of curiosity, can the holes in other large trees be planted into, like say old oak trees?