As someone who has lived most of his life in the south of England I can assure you that the landscape is not always a lush green garden. It can look totally different in August from its appearance in June, when it is mostly green.
The events of the BoB take place around harvest time. The predominant crop is wheat. Wheatfields at harvest time (and the stubble fields that are left afterwards) are some hue of gold/sand/brown, not green.
Even pasture land will look gold/brown after a couple of weeks in the summer without rain. Contrary to what some people seem to think, it does not rain every day in England.
Having said all or that I agree that the specific colour palette was poorly chosen.
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