Hi all,
I delete top views on any flower, bush, grass, house that are in the 2-d object class, usually anything that isn't a tree.
It's a simple fix.
Use one of the objects in the 'object type' or import something to that type if everything has a top view.
Do not try this if you've already started planting as it will cause issues requiring selecting and updating each object planted of the type.
Simply check 'apply settings to all objects of this type' box and press 'OK'
Hope it helps someone moving forward.