Either over or under watering is a problem. If you are overwatering their may also be some loss of foliage color as the green fades toward yellow. Allow the soil to dry out between waterings. It does tend to bloom best in spring and early summer so if you can get it back in good health and vigor it should be nice again for you next spring. After is shows signs of new growth start to feed it with a soluble plant food such as Miracle Gro at the low label rates.
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