I brought my two Hibiscus potted plants indoor for the Winter. One is thriving, the other is almost dead. I moved the latter one to another room so it could be near a window, and water them both regularly. Both pots have drainage holes, but the water does not appear in the bowl underneath the pot. I tried spraying with plant food - "Miracid" which claims to stop yellowing leaves- but it got worse. I'm afraid I may have killed this beautiful plant. Can you help?