All gas prices do is set the rate of inflation, there isn't one company or human that doesn't depend on it. Gas goes up so does Milk, Nancy's hair cut, Fred's round of golf, etc.
This is true but economics tells us that some products are inelastic meaning due to lac of substitutions people will pay what they have too. Milk is some what inelastic soy milk or other milk will be cheaper thus inhibiting people to make the switch to the cheaper substitution. Landscaping is no different gas keeps going up LCO's bids will go up home owners will say "its too expensive" and look for the guy who will do it for a lesser amount, they just may invest in a mower them self.