These tiles are porous and have small triangular gaps on the top so yes, they will clog if leaves enter the gaps. However, the gaps are really small and we've never had issues with customers getting debris inside of them. Yes, blowers will easily move the leaves. These tiles are not warranted against fading and breakage, but are covered under a 15-year limited warranty. Please see the warranty document under "Warranty" tab on the product page for more details.