Should I cut off all the spotted leaves?

Remove the worst ones to stop the spread. If most of the plant is spotted, focus on improving air flow and keeping the foliage dry.

Is this disease contagious to my other plants?

Yes, fungal spores can travel through the air or water splashes. Isolate the affected plant until it recovers.

Slender amaranth: spots, causes and fixes

Check these first

Look for circular brown or black spots on the leaves.
Check if the soil is consistently soggy.
Ensure the plant has enough space for air to move around it.

Likely causes

Fungal leaf spot
Most likely
How to tell: You will see brown or black circular spots on the leaves, sometimes with a yellow halo. These spots often grow larger if the air is humid.
What to do: Remove and dispose of any heavily infected leaves immediately. Improve air circulation around the plant and avoid getting water on the leaves when you irrigate.
Overwatering
Possible
How to tell: The soil stays soggy for too long, creating an environment where fungi thrive. The leaves may look limp or develop dark, water soaked spots.
What to do: Adjust your watering schedule to every 2 to 4 days. Only water when the top inch of soil is dry to the touch.

Leaf spots on other plants

Find out what's wrong with your slender amaranth

The list above covers the usual causes. Pocket Botanist looks at a photo of your actual plant and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.

When to worry

Worry if the spots are spreading rapidly across the whole plant. A single spot on an old leaf is usually nothing to panic about.

Stopping it coming back

Water at the base of the plant rather than over the top of the leaves. Keep the area around the plant clean of fallen debris.

Slender amaranth: spots? Check yours with a photo

Every plant is a little different. Take a photo of your slender amaranth and Pocket Botanist tells you which cause is most likely, how serious it is, and what to try first. A few checks a day are free. Save the plant and you get care reminders timed for it.

Get the app · Or check it from a photo now, free

Questions people ask

Should I cut off all the spotted leaves?: Remove the worst ones to stop the spread. If most of the plant is spotted, focus on improving air flow and keeping the foliage dry.
Is this disease contagious to my other plants?: Yes, fungal spores can travel through the air or water splashes. Isolate the affected plant until it recovers.

Guides to these causes

Leaf Spot

Why are there spots on my slender amaranth leaves?

Check these first

Not sure what's wrong with your slender amaranth?