Can I prune a leggy amaranth to make it bushier?

Yes, you can pinch back the top growth to encourage side branching. Do this once the plant has established a few sets of true leaves.

Will a leggy plant recover?

The existing stretched stem will not shrink, but new growth will be stronger once you provide better light. You can stake the plant if it is too tall to stand on its own.

Slender amaranth: leggy growth, causes and fixes

Check these first

Assess the number of hours of direct sunlight the plant receives.
Check if the plant is leaning toward a light source.
Measure the distance between the leaf nodes on the stem.

Likely causes

Insufficient Light
Most likely
How to tell: The stems are long and thin with large gaps between the leaves. The plant leans heavily toward the nearest window.
What to do: Move your plant to a spot that receives at least 6 to 8 hours of direct sunlight daily. If you cannot provide enough natural light, place it under a high output grow light for 12 to 14 hours a day.
Crowding
Possible
How to tell: This is less common for this plant, but usually happens when seedlings are planted too close together, causing them to compete for light. Thin out your seedlings so each plant has at least 8 to 10 inches of space to grow.
What to do: Carefully pull out or snip the extra seedlings to improve airflow and light penetration. Ensure the remaining plants have enough room to develop strong, sturdy stems.

Leggy growth in 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

It is normal for this plant to grow tall, but it should not be floppy or weak. Worry if the stem cannot support the weight of the leaves.

Stopping it coming back

Keep your amaranth in a bright, sunny spot from the moment it germinates to ensure compact growth.

Slender amaranth: leggy growth? 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

Can I prune a leggy amaranth to make it bushier?: Yes, you can pinch back the top growth to encourage side branching. Do this once the plant has established a few sets of true leaves.
Will a leggy plant recover?: The existing stretched stem will not shrink, but new growth will be stronger once you provide better light. You can stake the plant if it is too tall to stand on its own.

Why is my slender amaranth growing so tall and leggy?