After you were gone for almost a month, you garden get totally dry as no one take care of it. You can't just abandon a garden like this for such a long period. There was no rain in the time you were gone, so your entire garden got totally dry and it's almost dead. Now it's up to you to revive the garden. It needs a lot of maintaining but it can be saved. Do whatever is needed to save your little garden and make it become as it always was, one of the most beautiful gardens in the entire city. Best of luck!
Walkthrough for Maintaining The Garden