---
title: "Hi everyone! My Thai con is growing a new leaf which is so exciting,…"
description: "Hi everyone! My Thai con is growing a new leaf which is so exciting, but yesterday it developed these brown spots on the new leaf which is disheartening. Does…"
url: "https://getplanta.com/community/lZ7uAE3pQ86jnFGxrCwLrg/CQZViK4d0549Ci9acIlZK6"
community: "Anything about plants"
author: "Carm"
published: "2026-07-26T14:08:10.368575Z"
language: "en"
image: "https://images.getplanta.com/v1/resize/r2Wl8wKBYDm2V39GpD56OAyau9f52xGdSp3CmSs9um4/DS2sd5ikSO2rRrnntZYP4A.webp?size=large"
---

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# Hi everyone! My Thai con is growing a new leaf which is so exciting,…

_Posted by Carm on 2026-07-26_

Hi everyone!

My Thai con is growing a new leaf which is so exciting, but yesterday it developed these brown spots on the new leaf which is disheartening. Does anyone know what could be causing this? I haven’t repotted it recently and no signs of Thrips.

![Attachment 1 of 2](https://images.getplanta.com/v1/resize/r2Wl8wKBYDm2V39GpD56OAyau9f52xGdSp3CmSs9um4/DS2sd5ikSO2rRrnntZYP4A.webp?size=large)

![Attachment 2 of 2](https://images.getplanta.com/v1/resize/r2Wl8wKBYDm2V39GpD56OAyau9f52xGdSp3CmSs9um4/YFpcXakQSx2lTlkMZWXnVw.webp?size=large)

## 6 comments

### Amelia commented on 2026-07-26

The only thing that I can think of is maybe sunburn??  
But it looks like you’re using a grow light in the pictures, so that doesn’t really make sense.

#### Carm replied on 2026-07-26

I do a mix of sun and grow light, depending on the weather. If it was a sunburn would I see effects on the other leaves too? None of them seem to have any changes.

#### Amelia replied on 2026-07-26

That’s interesting… I’m stumped, but I would suggest to put the pictures into Dr. Planta to get a diagnosis.

### Ebony commented on 2026-07-26

This could be sunburn if the light is too close since it’s still so new but it could also be a sign of thrip too so look at the leaves really well, if you can unfold that new one without damage I would

### JKPsych commented on 2026-07-26

Everything that everyone has already said and it could potentially be mechanical damage

### plantgeek commented on 2026-07-26

brown spots on new growth is almost always a watering or humidity issue. it's caused by water becoming trapped in the unfurling leaf and causing bacterial growth. check the roots asap.

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