I would suggest you offer 3 packages. The first a mow&blow at (guessing)$60 per month. A middle package at $90 & the full service package you describe above at $120 (adjust figures accordingly). This way you have three bids on each job, dramatically increasing your chances of landing a large volume of contracts. Also this way your advertisment can read "Complete lawn service starting at $60 per month". The phone will ring off the hook. Mow&blows can be as profitable as your full service if you have the volume & proper equipment for efficient mowing.