I have heard that, and no I have not done that................That is one of the rules for a perfect looking yard/garden.
My plants sort of ended up where they are, because as I would bring a plant home I would wander the yard..................hummm where to put this one? Find a spot dig a hole dump it in. Also as the pond expanded a bunch of plants got dug up and moved. Again.........where oh where to stick this one lol I am still a plant addict, do my best to stay out of nurseries, sort of out of space in the inside yard, but do have a nice big field in the back................ except that is a deer heavy area.
Most of the plants were lowes nearly deads. A dollar or 3 dollar plant. Very few were full price. there is also a nice nursery that has a get rid of area, plants/ trees 1/4 the price, a bunch came from there too. End of season is a great time to get some really neat plants.
I have lost some from the cold this winter, the crape myrtles are coming back from the roots. Butterfly all died back to the roots, nadina slowly coming back. Anything that died and did not come back stays gone.
I do have one hibiscus it should never have lived, but it is coming back..............go figure lol