MsDoe said: Welcome to the forum!
There is most likely a problem with the plant's roots.
Can you share some more information with us? I see that it is double potted.
What sort of soil is it in?
How do you water?
How often do you water?
Also, did you follow the anti-gnat pot topper instructions to remove 1/2 inch of soil before adding the product?
It is normal for it to take on the brown/tan coloring of the underlying soil, that is not the problem.
cwhitt said: I am thinking maybe too much water. The presence of gnats might indicate that since they like moist soil. And I agree it is planted too deep. If it were me, I would gently dump out all the soil and inspect the roots for rotting. Remove any rotted roots, and then re-pot it. I assume that inner pot has drain holes. I would lift it out and check to make sure there is no standing water in the outside pot.
NMoasis said: Richtj
If the bases of the leaves are rotting below the soil surface, you've got rot: too wet, not enough oxygen. Any possibility of saving the plant will require removing the plant from the soil, cutting out all rotten roots and doing a complete repot in faster draining soil with a lower peat content. Agree that it looks too deep, so after repotting you might need to stake it upright until the new roots take hold. It might benefit from brighter light too.
cwhitt said: A coarse, readily-drained potting medium. I see that Amazon actually has a couple of Snake plant potting mixes. I never knew that. Looks like Walmart carries one also. Might be worth a try, but probably any succulent mix would work. Just make sure you use something that drains well.
MsDoe said: OK, apologies if I over-explain, but I think this will help.
Make sure the pot has lots of drainage. If the roots are really bad, get a smaller pot, with lots of drainage holes. Plastic nursery pots work well and help keep the plant healthy. It can go inside the cache pot, but never leave it sitting in water.
Get a cactus/succulent soil mix. If possible, add extra grit, up to 50% of the soil. I've had success with pumice, pea gravel, and chipped granite poultry grit. Screen and wash to remove fine dust, which plugs up the air spaces in the soil. Roots need air!
Repot. If you plan on using the anti-gnat layer, leave space for that. The plants look like they're potted too deep now.
If necessary, prop it up with sticks, or rocks at the base. This should only be needed until the roots re-establish.
With a fast-draining pot and soil, you can now water correctly. Water thoroughly until the soil is wet and water runs out the bottom. Let it get quite dry before watering again. This may be two weeks or so, check carefully until you know what works for your situation.
Locate the Sanseviera section of the forum, and enjoy the enthusiasm others share! (OK, they're kind of nutty, but in a fun way.)
The thread "Sansevieria, greatest house plants alive!!" in Houseplants forum
Richtj said: Walmart ... I wonder if they'll deliver to the UK
I will keep an eye out at my local garden centre.
Thank you.