Do you include landscaping with staging services?

You point out an often overlooked aspect of staging. Landscaping isn't just important; it's critical.  You need to create excitement before a prospective buyer enters the home. If they're turned off when they turn in, you'll probably lose them.

I have never used the services of a stager but I would definitely give the sellers some advice on the look of their landscaping. It plays an important role  

Landscaping is crutial but I believe the cost associated with the landscaping aside from lawn mowing should be the homeowners responsibility unless it's built into the renumeration. Just my thoughts.

first impression begins at arrival ..landscaping is critical any professional stager would know that. keep up the good advise

As I deal a lot with vacant/investor properties, often the interiors have been re-done with fresh paint, new fixtures and fittings, new carpet and often even new kitchens.  The outside conditions vary from 'tidy' to unimpressive.  As a home stager, our focus is mostly on enhancing the buyers experience and impression of the interior of the home.  However, as part of our consultations we evaluate the exteriors as well and make recomendations for improvements to the landscaping.  Sometimes the client makes their own improvements, in cases where they are interested but unable to do the work themselves we either have one of our partner businesses give an estimate or offer an hourly rate to do the work ourselves.

Curb appeal is crucial; it's what turns a drive-by from a drive-away to a stop-and-stay.  It's the very firt impression of the home, and all that hard work put into the interior staging means nothing if they don't see it.  Take a look at the differences it made on some of my previous listings:

This obviously didn't take to much time or investment.  Some pruning, weeding, and a couple bags of red mulch go a loooong way!  After 8 months on the market with few showings and nary a second look, this home staged by Sold By Design received an offer in the first month after showing!

Or this one:

We just mowed, trimmed, pruned, added some trellises (you unfortunately can't see them as well in this pic) and some potted plants to add depth and distinction.  This home sold quickly in a market that had backlogged.

Remember, the first taste of home is what it looks like as you drive up.... what does your clients' homes say?