If you want the very best results growing Gardenias, Azaleas, Camellias and Roses, you have to know one trick. You have to invest in a planting soil or potting mix that you’re going to put them into as these plants are flower producing machines requiring a special mix of soil and nutrients to get the very best results. Scotts Osmocote® Rose, Gardenia, Azalea & Camellia Mix