How often you have your lawn sprayed is really only part of the pricing equation. When you start budgeting for a professional treatment, the true driver behind your total bill is the size and layout of your lot. If you have a small suburban or urban yard under a quarter-acre, the job requires very little chemical and takes just a few minutes, keeping your bill on the lower end. However, if you are tackling a sprawling lot or multi-acre property, technicians will need heavy-duty backpack sprayers or truck-mounted rigs and significantly more formula, which naturally pushes your estimate up. Just keep in mind that these natural formulas often carry a higher upfront cost and break down much faster, meaning you'll need more frequent touch-ups throughout the season.