Dirt Mound at Base of Tree

[bills123]

What I think is a sycamore tree with dirt mount and thin layer of mulch. From old pictures it looks like this was added by previous homeowner. They lived here for the last 6 years and it looks like the tree had been there for awhile when they moved in. Any advice on removing the mound? Is it necessary? Are the plants growing under the tree ok? Any help would be great. Thanks.

Edited March 23, 2023 by bills123
Clarification

[Puffingbilly413]

13 minutes ago, Steve Bullman said:

Their sycamore is maple 

Interestingly a lot of old folk up in Scotland will still refer to sycamore as plane. Don't hear it that often anymore though. 

[Mick Dempsey]

What we call acacia they call black locust.

Robinia Pseudoacacia.

[peds]

Dirt can be found under fingernails and the on the top shelf of magazines at your local newsagents. 

 

That is soil, or earth.

 

Flipping yanks.

[nepia]

Our poplar, their cottonwood

[Mick Dempsey]

Horse chestnut = Buckeye.