Which of the following does NOT represent a common practice for landscape contracts?

In the context of landscape contracts, a practice that does not align with common standards is ignoring regulatory compliance. Adhering to regulations is crucial for landscape professionals, as it ensures the work meets legal requirements related to safety, environmental protection, and local zoning laws. By following regulations, landscape contractors can avoid potential legal issues and create a professional reputation.

On the other hand, fixed-price agreements provide clarity on costs for the client and contractor, helping to avoid disputes over payments. Service guarantees enhance client satisfaction and confidence in the contractor's work, often leading to repeat business. Additionally, written agreements are fundamental in the industry for documenting the scope of work, terms, and conditions, ensuring both parties are on the same page regarding the project. Therefore, regulatory compliance is essential and ignoring it would be a deviation from standard practices in landscape contracts.