Amend soil or go with native soil?
I just bought a camillia "Swan Lake" in a 15 gallon container. I want to put it in the ground. The native soil is sandy and probably not acidic enough. When I dig my planting hole, I will make it about 4x the width of the container. My question is: How do I make the soil acidic? Do I buy amendments and mix it in with the native soil (the backfill)? If so, what proportion of amendment to native soil should I use in general? Or do I use only the native soil and add a fertilizer for acidic plants? Any advice would be appreciated. Thanks!