What’s wrong with my calathea plant?

It might have an insect infestation, here are some common diseases and what to do about them:

https://www.nature-and-garden.com/gardening/scale-insects.html

Also here is a care guide:

https://www.nature-and-garden.com/gardening/calathea-care-watering-disease.html

Since it looks like the leaves are turning brown, there may not be enough humidity. Here's a link:

https://www.diynetwork.com/how-to/rooms-and-spaces/floors/how-to-paint-old-vinyl-floors-to-look-like-new-tile

It's either too much water or not enough. Pinch off the dead leaves and check the soil moisture.

Hello. I suspect it might need more humidity. Please refer to this link and adjust your watering and humidity perhaps misting with a spray bottle might help. Often when something like this happens to my plants I trim off the edges. In my case I have to be more diligent with watering and misting with winters heating situation.

I don’t believe it is a pathological disease from what I can see from your photos.

https://www.depts.ttu.edu/plantresources/Pages/Landscape_Information_Sheets/Interiors_Info/Calathea_sp.php

https://www.depts.ttu.edu/plantresources/Pages/Landscape_Information_Sheets/Interiors_Info/Calathea_sp.php

In my opinion, your calathea is turning brown bc of too much sunlight and not enough humidity.....

First, it looks as though it needs to be repotted in a larger pot. Second, leaves browning and curling is due to lack of proper watering - soil should be kept moist. Third, salts from tap water can also cause leaf curl. Please use distilled water and some MiracleGro per instructions. I'm sure you will see him shoot up in happiness!

Try using purified water. Other possibilities are fertlizing when dry or uneven watering.

The most common reason your Calathea’s leaves are turning brown on the edges could be due to your tap water. Tap water contains salts, chlorine, minerals and fluoride – all of which can build up in the soil of your plant causing the tips of the leaves to burn, turn brown, and curl up.

Your Calathea is a tropical plant, so it will thrive in more humid environments. Increase the humidity around your plant by misting the leaves on a regular basis, using a pebble tray, or moving a humidifier nearby.

Your Calathea prefers soil that is consistently moist. Be sure you’re not over or under watering your plant. Keep a consistent watering schedule–water when the top 1”-2” of the soil is dry.

Hi Sogand, The most common reason your Calathea's leaves are turning brown on the edges could be due to your tap water. Tap water contains salts, chlorine, minerals and fluoride – all of which can build up in the soil of your plant causing the tips of the leaves to burn, turn brown, and curl up. Also, don't water on a schedule, go by your soil moisture instead! Everyone’s conditions are different. The size of your pot, the type of pot you have (terra cotta vs. plastic for example), the temperature, type of soil, all play a role in how quickly the soil dries out.

So forget that calendar schedule for watering and use your finger instead. Calathea plants like to be on the moist side, but they do NOT like to dry out completely.

Hope this helps you out. **Also, you can boil tap water to purify & put into a container for watering.

Hello,

It looks as if the air is too dry around the plant!

Hi Sogand: There doesn't seem to be anything wrong, leaves just die from old age. Snip it off at the end of the stem and throw it away. Don't over or under water your plant, and fertilize it once a month or so. Keep it out of direct sun, and I wouldn't worry unless a bunch of leaves turn like this. You might get 1 or 2 like this every couple of weeks.

I am not a gardener, but this article was very interesting. Seems like a common issue with this plant. https://www.ohiotropics.com/2019/08/30/calathea-care-brown-leaves/

Looks like perhaps overwatering.

It's probably lacking nutrients. I'd add some fertilizer to the soil.

This will help you care for a calathea and see what may be wrong: https://www.youtube.com/watch?v=c1tGgEd7o74

Heres a great site to help you care for your Calathea.

https://www.thesill.com/blogs/plants-101/how-to-care-for-calathea

I always find when this happens, the plant needs more humidity. Use a fine mist squirt bottle once of twice a day to just add a little moisture.