noticed the same, as long as you are in build mode with the gun out and place one tree or rock and find it dosnt fit nice, you can remove it. As soon as you put the gun away and activate another planter or do something/build something else, you are not anymore abel to remove, only the planter option help to remove ALL of the same kind of foliage.

If its possible, it would be nice to remove stuff even later on, if one decide to make changes and not being forced to remove all of the 264 "English Ivy mix" you have placed before carefully.

Thanks

edit:

errmmm never mind XD - you answered it already on the discord let me copy paste that here for OP:

[15:09]reinerSCT
"I would recommend to choose the type you want to remove in Add vegetation mode and switch to Remove vegetation mode afterwards. This way you can visualize the type first.
The reason you have to choose the type first and apply the changes is, that otherwise this could affect server performance. For example, if you delete one tree, all trees of the same type get removed and immediately replaced without the one that was removed. This is the only way i could get removing separate foliage to work.
If you would be able to remove multiple types at the same time, this could be bad for the server. Depending on how many instances are already placed and how many types are affected."


Tested as explained by reinerSCT.
works as intended

choose correct planter
choose plant/rock type to remove
switch to remove tool

click

aaand its gone :)

YESSSS !!!