Am doing landscape architecture and consulting for garden owners in another country.

I guess your question is too open

without any narrowing down re color etc.

how large a space are we talking about, just a couple of square feet?

soil?

and any tree usually does not need trimming, you might want to prune it if it gets too big.

could be helpful to get a landscape architect/ plants person for a 1-3 hour long consulting onto your property,

leaving you with plant lists and some sketch as a result

that could avoid a lot of mistakes, boost your learning curve and probably save money & time in the long run.

just my 2 cents,

best of luck, Lin

remove the tree ...

replace the grass ...

make a small stone protector around the end of the pipe ... put an draining end cap on it ... something like this.. but not glued in .. keep rodents out.. but allow for cleaning

https://www.lowes.com/pd/NDS-4-1-4-in-L-x-4-1-4-in-W-x-4-in-dia-Round-Grate/1002671

and finishing running the roses down the wall ...

else.. just fill that space with more roses ... imo.. anything else out there will just look like a lollipop of non matching plants .. just a blob at the end of the wall

ken

Here are some ideas: