15The surrounding land changes in the movies
All of the Harry Potter movies become darker as they progress. This is because, at the beginning, Harry is just excited to go to Hogwarts. However, as Harry continues to mature and learn about his parents, things become much darker in content.
The Burrow is no different. The once pleasant and vibrant home fell
victim to the same darkness as all the other places in the Harry Potter world. When first seen in Harry Potter and the Chamber of Secrets, the surrounding land is grassy and there's a shining lake nearby.
However, once audiences see it again in Harry Potter and the Half-Blood Prince, the lake is completely dried up and the once grassy area has become marshy. It represents how times were changing during that period of time due to Voldemort's return.