Every time you are prompted to take care of it, go at once, water and fertilize it once, and don't order to kill insects. Every time after nursing, a dialog box will appear, saying that there are bugs or thieves, and the thieves will be killed immediately. Kill a thief once, shake it once. If there is a bug, fly to YZ, the old florist, and just click it. If you plant it as I say, you can shake it six times without special circumstances.