Does the neat hedge improve the value or desirability of any unit within the complex? I’d be surprised if its neatness isn’t a positive benefit to all. Just a thought. Also, are these amounts sufficient to warrant a possibly divisive matter being given life?
Despite having given an answer about how differential funding might be done, I agree that it is probably not worth the bother. Most likely, trimming the hedge is a minor cost in the overall costs of running the scheme. Most likely all benefit from the good appearance of the whole scheme both from trimming the hedge and other maintenance of the common property.