An ill maintained landscape of your home or business conveys that the people inside are ill maintained and for a business it conveys that clients are ill maintained.  A poorly maintained landscape says the below about your business so before your clients even enter your building you are imprinting negativity on them which could be the source of not having repeat customers or high staff turnover, both affecting your reputation negatively.
* Flower beds are crowded with weeds, other plants taking root or overgrown shrubs = money and clients will have trouble finding your business or will just turn away
* Flower beds and sidewalks are not edged = boundaries will be crossed
* Trash not picked up on a daily bases = conveys that you don’t care enough about your business so how can you begin to care about your clients

All of this will cause similar issues with homes, just replace "clients" with "opportunities" and look what you could be missing out on!
Maintain or care for your lawn/landscaping and you will give your reputation an instant boost!