I don't know what kind of home this is or how much snow there is to remove but landscaping and snow removal is generally considered a tenant responsibility on a single-family home.I don't believe in rent reductions.

any landscaping/ gardening costs? 

@Scott Houin  There may be other non-obvious things they're doing, like common area maintenance, landscaping, road or parking area repairs/striping/paving or paying for insurance for the common areas.You might also look at what it takes to serve on their board.

My response, and the response of all owners should be, "well, the best thing you could is do an internet search about the statistics here".  

It is in need of some serious repair, both inside and on the landscape.

What about landscaping? 

A property manager. a construction co. a RE broker. a bank or mortgage broker. a law, accounting or insurance firm, an appraiser, surveyor or building inspector. a service provider (janitorial svc, maintenance, electrician, plumbing, foundations, septics, landscaping, remodeling, painting...)

My guy is landscaping company by weekday and independent contractor weeknights and weekends. 

I’ll be following along.Make sure to address the landscaping though.

However, people look at a lot of aspects like location, floor plan, price, condition, neighbors, commute, landscaping, smells, etcWhat I've done is an "open" and placed recorders around the place to capture the conversations people make so I can identify some of their comments good and bad.