Any gardeners help identify what's killing my herbs?

[Burnsy2023]

I bought a sage plant which I didn't realise had some sort of mildew or fungus which ultimately killed it. It seems to be spreading too. Any idea what I should do to stop my oregano plant dying?

Pic: https://imgur.com/gallery/KA53TnQ

 

[Randomface74]

step 1. isolate diseased plant so other plants don't die
step 2. whatever people suggest in this thread
step 3. destroy diseased plant

 

[200sols]

Waterlogged soil? Frost damaged?

 

[Derek W]

Do what this guy suggested on your post....

hetjr•2h ago via iPhone
Give Emerald
Just give it some thyme. It’ll feel better in a mint or two.

 

[d_brennen]

Waterlogged soil? Frost damaged?

My mint looks like that at the mo, and it definitely was waterlogged and under a foot of snow not long ago

 

[Dis86]

Does look like frost damage on the edge of the leaves. I can't see any of the usual signs of fungus on that.

 

[Adam Tench]

Usually temperature sensitive plants look like that after it has been too cold. Hopefully it resolves itself. I'd clip them back and wait for it to grow out again