I want to make a garden with bushes around the outside like this:

Green = bushes, red = flower clock (once I get it..), blue = stumps, pink = arch PWP.
Did I get the grey buffer zone right and can I put the bushes right up against the side of the arch? Or will I have to leave a space between the arch and the bushes?

Green = bushes, red = flower clock (once I get it..), blue = stumps, pink = arch PWP.
Did I get the grey buffer zone right and can I put the bushes right up against the side of the arch? Or will I have to leave a space between the arch and the bushes?