Posted: 31/08/2016 at 22:43
If you start off with john innes you only need to top dress for a year or two.. camelias can remain in pots for a few years. Eventually you repot.
use the compost you have for summer stuff or other smaller things. You would change the compost every year or so if you had seasonal plants in them. After a summer display for example you would use fresh compost for the following season
It is just that john innes contains the bulk and qualities that artificial composts lack.
camelias don't really need soil acidifiers like sulphur chips etc.
Hope this helps ripply