Mondo (Dwarf) Yellowing

Question

Planted dwarf mondo grass around pavers bordering our fountain. They were nice and green when planted but now are yellowing. Could it be the PAVER SAND/PAVER BASE? They’re grouped together closely with 1-inch spacing. The area gets shade in morning and sun in afternoon but have kept shade covering them.

Answer 1

This article may help: https://www.gardeningknowhow.com/ornamental/groundcover/monkey-grass/monkey-grass-disease-crown-rot-causes-yellow-leaves.htm