We are considering an amendment to one of our rules (aka bylaws or articles) to specifically prohibit growing of invasive weeds on unit areas for just this sort of reason. Even without such a rule, most would have generic rules that prohibits activities that interfere with the reasonable use an enjoyment of common property or require maintenance of the unit.
Having an invasive plant that runs out into the common property could be argued to be a breach of the rules. Similarly, being so messy as to detract from the appearance and enjoyment of the common property could be argued, perhaps.
I have encountered examples of complaints about general mess that I don’t find reasonable. There is a great deal of range in people’s tolerance and variety in what offends one person’s eye but not another person’s.
Is there a reason? Is the messy person elderly or unwell and unable to maintain the garden as well as he or she might like?