The Walkers were happily deciding how to spend one wonderful winter morning. But all the plans were broken when a worried Mr. Rat showed up at their front door. He said that his wife felt bad, and all the family immediately went to see poor sweet Auntie Sheep. She was depressed and spent the last few days in bed because she couldn't do what she loves best, to grow plants in the garden! Mr. Rat asked the Walkers to help set up a greenhouse where his beloved wife Auntie Sheep could grow her flowers all year round. It's pretty hard to find green plants in winter. But the Walkers are not going to leave Auntie Sheep feeling blue until spring! So the animal family needs their super-hero resource: you! Help the Walkers bring a smile to Auntie Sheep's face by creating a winter garden for her!