1. High implementation and maintenance cost
2. Limited knowledge and skills of design professionals, contractors, and maintenance staff
3. Limited access to sustainable materials and plants
4. Limited understanding or resistance from clients or stakeholders
5. Site constraints and limitations, such as topography, soil, drainage issues, and previously developed sites
6. Lack of supportive policies and incentives from local or state governments
7. Climate change, unpredictable weather patterns, and drought conditions affecting plant health and survival
8. Balancing aesthetic goals with sustainable performance requirements
9. Conflicting design goals and priorities (e.g., maximizing biodiversity vs. reducing water usage)
10. Ensuring long-term sustainability through adaptive management, monitoring, and maintenance.
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