JB, mainly I have August Beauty, Daisy and radicans. I have about 7 August Beauties which are taller than I but I'm only 5'9" tall. The Daisy and radicans are much smaller and the radicans is a spreading one.
Carol is right. They need acid soil, so I feed twice a yr. with Miracle grow for Gardenias, Camellias, and Rhododendrons.
I've found it next to impossible to grow gardenias indoors unless the requirements are perfect.
Lee
