I live in the Sierra Mountain Range of northern California on land very similar to the Horman's.
Because of the danger of forest fires, there is a tremendous amount of yard work that needs to be done including removing all dead wood off the trees, clearing leaves and pine/fir needles and cones from at least 30 feet surrounding the propane tank, firewood pile and all structures.
Roofs have to be cleaned of all debri and all grass needs to be cut down to ground level, regardless if it is a lawn or native grass, along the road and around the wood pile, propane tank, house and outbuildings.
Ponderosa pine trees drop an amazing amount of needles and the black oak lose all their leaves each fall.
In California, anyone who does not perform their yearly fire hazard reduction requirements can be given a fire hazard reduction violation notice which indicates all the work that must be done to come into compliance. Refusal to comply will result in a citation to appear in court and a fine.
Where I live, very few people have lawns and the houses are located in the woods as the Horman's house is unlike houses that have been built on a bare lot. Because of this, there isn't the need to have a landscaper but someone to maintain the native trees, shrubs, grasses, etc.