Gardenia rhymes with:
la-nina, menia, ammonia, banja, banya, begonia, calif, california, catalonia, catania, chemania, dania, dunja, espana, gonya, kenya, la-nina, lasagna, lavinia, livonia, menia, naranja, pennsylvania, pneumonia, sonia, sonja, sonya, tania, tanya, titania, tonya, valonia, vanya, virginia
Gardenia sounds like:
garden, gardena, gardin, gardini, garduno, gardyne, garritano, garten, gartin, gartman, garton, gerdeman, giardina, giardini, giardino, giarratano, giordani, giordano, girardin, girten, girtman, girton, gordan, gordana, gorden, gordian, gordin, gordon, gortney, gorton, gourdine, gradation, graden, gradney, graduation, grattan, gratton, graydon, greetham, gretna, gritton, groden, grodin, groton, grutman, guardian, guardin, guardino, guertin, gwartney, gyration, gyrodyne