Hello,
My plant has been suffering for a long time from something but I don't know what it is.
It used to be huge and healthy but not anymore. It lost most of its leaves and some of the new ones grow with cut edges or with brown stains.
It is held inside the house, I water it once a week (with regular tap water) and it stands in a place with no direct sunlight. The soil was replaced a year ago approximately but the situation did not improve.
If anyone knows what type of plant it is or what should I do to heal it I would be very happy to hear some advice.

Many thanks!!
Marina

Your plant is a Peperomia obtusifolia. It does not have a disease, but it does have a root problem. I'm not sure what caused it to deteriorate initially, but the repotting has definitely aggravated the problem. The pot is too large for the root system and the soil quality does not look sufficiently porous.

I don't know what you mean by a "place with no direct sunlight," but I suspect you have it too far from the nearest window and that may have been the reason it originally started to decline. Keep it close enough to a window that it gets a couple of hours of direct sunlight each day and bright indirect for the rest of the day.

You may be able to salvage it potted as it is if you improve the light and water it very carefully, but that will be difficult.

The alternative is also dicey. That would be for you to carefully undo the repotting you did by gently removing the soil you added while trying to leave the soil in direct contact with the roots intact. Then move the roots and just enough soil to cover them into the SMALLEST pot that they will fit into snugly. Use a porous potting mix with added perlite for porosity. The smaller pot and more porous potting soil will help it dry out more regularly so the roots no longer suffocate.

If you discover there are few healthy roots remaining, then take tip cuttings from each stem and root them together in water or a small pot filled with a porous potting mix.

I do not know what plant you have, but looking at it, your soil looks rather thick and dense. The leaves and stems indicates to me it has succulent properties (holds water on the leaves and stems), so it needs to have a more airy, porous media, to allow better airflow at root zone and not keep it too moist than needed. Plants roots gets compromised and rots away and manifests it by showing through the growth of the leaves, usually when overwatered edges turns brown, showing it is not able to drink up properly, and is ending up using its reserves remaining on the leaves, slowly drying them out and killed in the long run.

Try to improve your media, mix in some more pumice or perlite to lighten it up. Do not apply fertilizers, do not block drain holes with rocks and try to position in an area where it gets lots of bright light.

Hello
Does anyone know what the problem is with this house plant of mine? Are the leaves turning yellow? thank you