Are coffee grounds good for perennials, which perennials?
what benefit if any do coffee grounds confer?
Certified GKH Gardening Expert
They can be used to amend the soil of almost any plant! They will provide small amounts of nitrogen, as well as help contribute to the soil texture and drainage.
This article will help: https://www.gardeningknowhow.com/composting/ingredients/coffee-grounds-gardening.htm