Good point Fallon about LLC.
Screamin, I'm a retired insurance agent and underwriter, think I might be able to help you.
What is quoted to you is standard Contractor General Liability coverage, protecting you from legal liability if you damage someone's property or hurt someone in the course of your business.
Two huge factors for insurance. The first is if you have a backhoe. If you do, you MUST declare it and make sure you are covered for any form of excavation. And never, never never dig before you call. Sounds like common sense, but.....
And you will need to do many thousands of dollars of excavating work before you break even on profit. I have no idea if you need/use an excavator/backhoe in your driveway work. If you stay "on top" much less liability.
The second is workers compensation. This could add ten percent on to your payroll, not quite like providing health insurance benefits...but landscaping WC is expensive. It's a rate per 100/1000 of payroll. Many guys try to run bare, and if their helper is crippled, they are legally on the hook for life for that expense. It's a way to lose your house and everything else. If you work by yourself, fine. But once you hire a helper, be very careful. Oral agreements disappear into smoke when folks get hurt and spouses start calling lawyers.
A $500K primary liability policy topped with a $1M umbrella policy would be a good way to go.