---
title: "Hey guys, what is this on my cactus?"
description: "Hey guys, what is this on my cactus?"
url: "https://getplanta.com/community/lKxUkhzRR_aIJD7o1QvtwQ/ffzHUUq1EWcBqu3Wj5yt6E?language=ja"
community: "Pests, diseases and problems"
author: "Skimbutt"
published: "2025-01-27T22:11:39.912047Z"
language: "en"
image: "https://images.getplanta.com/v1/resize/3fIGaizgs07tC5bhcqVxp3kkJ_WqS2uQ0LI2D9fNhEw/4hZkxXAoS32aOkGD--HACg.webp?size=large"
---

[コミュニティ](https://getplanta.com/community.md?language=ja) / [Pests, diseases and problems](https://getplanta.com/community/lKxUkhzRR_aIJD7o1QvtwQ.md?language=ja)

# Hey guys, what is this on my cactus?

_Skimbuttさんが2025-01-27に投稿しました_

Hey guys, what is this on my cactus?

![2件中1件目の添付ファイル](https://images.getplanta.com/v1/resize/3fIGaizgs07tC5bhcqVxp3kkJ_WqS2uQ0LI2D9fNhEw/4hZkxXAoS32aOkGD--HACg.webp?size=large)

![2件中2件目の添付ファイル](https://images.getplanta.com/v1/resize/3fIGaizgs07tC5bhcqVxp3kkJ_WqS2uQ0LI2D9fNhEw/FXvQfasxS-OKeMP-ikb1Dw.webp?size=large)

## 9件のコメント

### nickさんが2025-01-27にコメントしました

Hmm.. id first check the roots, if the roots are okay, it may be fungal. U can use a fungicide or sterilize tools and cut it off making sure to completely let it callous. I just worry bc the center seems to be black when zoomed.

### Plantsmybelovedさんが2025-01-28にコメントしました

I've read that it's a separate type of cactus put on top of the base. Citing from Instagram but apparently they're incompatible in terms of Light requirements as well

#### Skimbuttさんが2025-01-28に返信しました

really??

### KJMさんが2025-01-28にコメントしました

It is definitely one cactus grafted on top of the other.

#### Skimbuttさんが2025-01-28に返信しました

damn, well does it effect either cactus?

### Tiffさんが2025-01-28にコメントしました

I'm totally confused. Are we talking about the cactus or the blemish on the cactus. Sorry, I thought the blemish was maybe a scar from an old injury.

#### Skimbuttさんが2025-01-28に返信しました

The blemish but I’m learning about the cactus itself 😭

### S.Rさんが2025-01-28にコメントしました

Moon cacti (round pink/red) are typically mutants that do not produce chlorophyll, which is why they have such vivid colors—from hot pink to neon yellow. Because they lack chlorophyll, they must be grafted onto a rootstock cactus to survive. The moon cactus is most commonly grafted with Hylocereus undatus (dragon fruit), but it can be combined with a green cactus of any species.

The blemish on the side of the green portion looks like mechanical damage to me, but keep an eye on it. If it keeps getting worse it’s likely rot.

#### Skimbuttさんが2025-01-28に返信しました

Thank you! This was the comment I needed 😂😂 I appreciate you!

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