This ESL-flagged plugin modifies placement of Cathedral Landscapes, Cathedral 3D Pine Grass and Northern Grasses, but does not modify any meshes/textures. Use this plugin as a full replacement for the older mods Northern Cathedral Reach Grass, Northern Cathedral Marsh Grass, Northern Cathedral 3D Pine Grass and Northern Cathedral Rift Grass.  Or if you prefer using only the individual regions, you can use the FOMOD installer to pick individual plugins instead (all are flagged ESL).

Compatibility with Northern Cathedral Grass
Because many have asked about how these plugins interact: NCG is a full blending of Northern and Cathedral in all parts of the world.  This plugin focuses specifically on 4 grass types of the world and is more like 80%/20% Cathedral/Northern.  While this plugin could conceivably be paired with NCG I cannot vouch for the results. Should you install the individual plugins from the FOMOD, they ARE complementary to one another.

3D Pine Grass records changed: LFieldGrass02, LPineForest01, LPineForest02, LPineForest03, LPineForest02NoGrass, LPineForest03NoGrass, LFieldGrass02NoGrass

Marsh Grass records changed: LGrassSnow01, LFrozenMarshGrass01, LFrozenMarshLichen01 and LSnowRocks01wGrass

Reach Grass records changed: LReachGrass01, LReachGrass01NoGrass

Rift Grass records changed: LFallForestGrass01, LFallForestGrass01NoFern

No Grassias Extended or Ultimate will remove the last vestiges of the short green Cathedral grass so is recommended.  Landscape Fixes for Grass Mods, and Cathedral Plants are also recommended.

Load Order
Northern Grass
Cathedral Landscapes 
Cathedral - 3D Pine Grass
NCRG plugin(s) 
No Grassias (use the Extended or Ultimate version)
Landscape Fixes for Grass Mods

Skyrim.ini settings (adjust to preference)
[Grass]
bAllowCreateGrass=1
bAllowLoadGrass=0
bDrawShaderGrass=1
fGrassFadeRange=10500.0000
fGrassMaxStartFadeDistance=7000.0000
fGrassMinStartFadeDistance=0.0000
fGrassWindMagnitudeMax=125
fGrassWindMagnitudeMin=5
iGrassCellRadius=2
iMaxGrassTypesPerTexure=3
iMinGrassSize=30

My Dyndolod 3.x TexGen Grass Settings
Direct 80
Ambient 12

My DynDOLOD_SSE.ini 3.x Grass Brightness Settings
; grass LOD brightness multipliers
GrassBrightnessTopR=0.413
GrassBrightnessTopG=0.309
GrassBrightnessTopB=0.171
; make bottom darker to fake shadowing
GrassBrightnessBottomR=0.200
GrassBrightnessBottomG=0.223
GrassBrightnessBottomB=0.225

All credit and thanks goes to the original authors of Cathedral Landscapes, Cathedral - 3D Pine Grass, and Northern Grass, JonnyWang13 and BrosisJK.