Does anyone know why my grass textures are like this? Only if I turn them off do the triangles disappear. I’ve seen a workaround is a reinstall but wondered if I got new textures from elsewhere they would overwrite and I could avoid that.
Have you tried deleting your rolling cache?
This “might” also come from a conflict with another addon.
may be also usefull existing topic:
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Hi thanks for your replies. It does appear the rolling cache doesn’t fix this, is there any other suggestion other than a re-install?
Does anyone know if the “fast” re-install of removing the packages folder work? Such a ballache to download all over again. Will I also need to add the WU in too or are they all rolled into the download now?
You could try this.
It doesn’t look like the same issue, but it may be worth a try.
If it doesn’t help, you can always change the setting back.
https://forums.flightsimulator.com/t/grass-looks-ugly/274878/11?u=thesevenflyer
So a full reinstall does indeed fix the grass issue.
115gb and a days worth of downloading to fix. 
Here is one thing you can try.
I believe that the “bf-texture-synth-lib” file in your Official One Store folder contains the textures.
You could try removing that bf-texture-synth-lib file from this location and pasting it somewhere outside the sim structure.
Start the sim
When it doesn’t find the folder it will make a new one.
If it’s texture related, it should fix it.
If that doesn’t work you can still replace it with the one you removed.
Ok. This might not be everyone’s problem but this has solved it for me so far.
I did the reinstall as suggested and my problem was fixed I then added all my community addons and then problem was back.
I eliminated down to the Trees Draw Distance fix which I admit I’ve not updated since I downloaded but it would crash loading into the flight. When it did load in the grass it was triangles.
I did think it could be the community version of RAF Valley as this is when I first spotted it but it loaded in fine.
So if anyone has this problem save the pain of reinstall and check your community folder.
Thanks to your help and suggestions.
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Having suffered the same hair tearing spikey grass, which, incidentally, is coupled with tree ‘sludge’ on mountainsides, I. along with a bunch of very patient multiplayer mates, have found the definitive answer.
Bijan Trees 3D.
If you have that in your community folder AND you are running Bijan Seasons 4.72 take it out and dispose of it! I bought 4.72, Trees 3D, Boats & Islands Enhanced UK and Germany. Maybe I should have been more careful but it was not clear to me that the Trees are superfluous. They are included in 4.72
Just to be clear, I am a 100% fan of the add on and would NOT be without it, but the instructions could be lot easier to understand.
Hello, I have a question regarding the display settings… Can someone tell me why I have the grass displayed like that?
Hello,
Did you ever resolve the issue if so how.
Thanks
Charlie McEwan
Hello Ron, is that Ron Attwood I used to here from some time ago (group Flights) that Bert invited me along to, i guess this is Old Hat to you but I recently update my Bijan scenery to V.72A and have the dreaded triangular grass issue along taxi way /run way verges?.
Wondered if you know of any other fix I dont run Bijan trees 3D in MSFS 2020.
Any help would be much appreciated.
BR
Charlie
Typo Ron,
V7.2A re Bijan Scenery
Apologies
Charlie