Pothos leaves turning brown one by one
Hi:) inquiring about my pothos turning brown, I wasn't able to find tips for this specific browning.
The leaves are one by one turning brown. It's only one leaf at a time and the browning always starts in the middle of the leaf, like on the first photo. J can't work out what's causing it:( two leaves have already completed died (photo 2) and I'm worried it could spread and kill off my entire plant. Any feedback is welcome 🩷🌞🌿
Some information:
- I've had this pothos for about two years. It grows slowly but the leaves are nice and green
- the soil is a regular indoor plant mix. I don't think there's a lot of perlite or whatever in it though
- I haven't changed the soil in about 18 months
- it gets plenty of filtered sunlight. The sun shines through a window onto it, but a thin white curtains takes out the harshness of the sun
- I water it about every 7-10 days
- I've used an indoor plant fertiliser on it twice, but recently. The browning had already started before the first time I introduced fertiliser
- the white marks on the pot are from watering it, the water is quite hard where I live
- it's stil producing new growth despite the browning
Thank you very much!