Lots of good ideas for you Bluefalcon!! This site pops up "jewels" of information in every forum! Eileens link brought an old formula to mind.
A-I-D-A is a sales progress - in its simplest form.

ATTENTION- get prospect's attention

INTEREST- arouse their curiousity

DESIRE- free offers are typically looked at as a trick, but for a landscaping maintenance company...brilliant marketing!

Personally I'd suggest the personal approach with your flyers, knocking and introducing yourself. It's harder on the psyche to risk rejection at the door, but you will get better results.

Hopefully, most of your prospects will already have a landscape maintenance company. Some will LOVE the opportunity to tell someone about the lousy service they think their getting from their existing maintenance company... (mow and blowers) - listen to them, have empathy not sympathy, and add -> "you'd be surprised how many people tell me that same thing..."

Others may be satisfied with their maintenance, or at least say they are - Don't give up there... offer this advice in your own words...

"You may be satisfied with the maintenance you are already getting, but if you take me up on my free offer, even if you don't decide to change to my company, your current maintenance company won't take you for granted in the future and you'll probably get an even better job from them.