How much money do you make per hour?
If the gardener charges you more per hour than what you make, do it yourself.
If the gardener charges you less per hour than what you make, farm it out.
Are you in a buyer's or a seller's market? For $65, you should have somebody mowing your lawn for six hours. If you ask your gardener how much for mowing and he says $65, ask somebody in need of a job to work for you at $10 per hour. Don't be the buyer; be the seller.