How to thicken a tree bed

We have a big maple tree in our backyard, at the bottom of the tree there’s some perennial plants that over the years have been getting thinner and thinner, how can I make them thicker again? I don’t even know…

small garden area, huge tree

I am writing to you for the second time as I wasn’t clear in my first message. I have a small garden area in the front of my house, facing south. We have a beautiful, huge tree that prevents the…