I've done what Kablammo warned not to do - recalculated a spline near a bulkhead, which means the spline now wraps around the lowered terrain.
I did a terrain backup but it was a long time ago, so when I load it I lose a whole heap of planting. Is there a way to restore the terrain and keep my planting? Or am I stuck manually re-sculpting? I should add that when I did a course build the ball rolled into the water as if the spline wasn't there anyway...