stone edging around weeping cherry trees
I have two mature weeping cherry trees flanking my driveway. Currently they have about a 6' diameter ring of mulch around the base. They are on a slight slope and have some, but not bad exposed roots.
We were thinking of making some very low raised planters around the base. I know these aren't good for trees when they are deep, but hear me out.
At the back they will be 2 inches off the ground expanding to 6 to 8" in the front of the tree. At no point will there be more more than 6" on top of any roots and the trunk will be at its normal soil level with no mulch around it.
Planter would be native soil with some peat moss and leaf litter mulch. We were thinking of planing some shade-tolerant herbs, hostas and decorative grasses.
Upside will be a nice use of the space aestetically and a cleaner mowing/trimming edge to border the tree.
Downside is obviously a risk to the tree. Dont' want to smother the roots, but I'm hoping the small depth will be okay.
Any thoughts on this? Haven't bought any plants or stone yet, so I'm still open.