Hi. It depends upon where you are and your unique site conditions. You might consider consulting with with a landscape professional who works in your area. Best of luck :)

which ones are the heliotrope? Are they the ones behind the ajuga? what are the pink flowers?

yes

I thought heliotrope was a sun plant? Is there a shade heliotrope?

In Southern California, which is where this garden is (Santa Barbara), heliotrope does better in part shade.