By Megdriver
Monmouthshire,
United Kingdom 
Do Gardenia's need Ericaecious compost?
8 Jun, 2011
Answers
They also need fast drainage, so I would add lime-free grit and perlite to the compost, if it has a lot of peat in it.
11 Jun, 2011
They do better in acid conditions, so yes, if you have it.
8 Jun, 2011