Can I fix the thin part of my cactus?

Unfortunately, the thin part will not grow thicker even if you provide more light. You can leave it as is or cut it off once the plant is healthy to encourage new, thicker growth.

Does my cactus need a grow light?

If you cannot provide at least 6 hours of direct sun, a grow light is necessary. Position it about 12 inches above the top of the cactus.

Peruvian torch cactus: leggy growth, causes and fixes

Check these first

Observe the amount of direct sun the plant receives daily.
Check if the stem feels firm or soft to the touch.
Measure the distance between the plant and the nearest light source.

Likely causes

Insufficient light
Most likely
How to tell: The new growth is much thinner than the base of the plant and appears pale or stretched.
What to do: Move the cactus to a spot that receives at least 6 to 8 hours of direct sunlight daily. If you are growing indoors, place it in a south facing window or use a high output grow light.
Excessive watering
Possible
How to tell: The plant grows quickly but weakly, and the stem feels soft or mushy rather than firm.
What to do: Reduce your watering frequency during the growing season, usually to about once every 2 to 3 weeks. Ensure the soil is completely dry before adding any water.

Leggy growth in other plants

Find out what's wrong with your peruvian torch cactus

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 serious if the top of the cactus starts to lean or bend under its own weight. This growth will not thicken up, but you can cut it back once the plant is in better light.

Stopping it coming back

Keep your cactus in the brightest spot available year round to ensure steady, thick growth.

Peruvian torch cactus: leggy growth? Check yours with a photo

Every plant is a little different. Take a photo of your peruvian torch cactus 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.

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Questions people ask

Can I fix the thin part of my cactus?: Unfortunately, the thin part will not grow thicker even if you provide more light. You can leave it as is or cut it off once the plant is healthy to encourage new, thicker growth.
Does my cactus need a grow light?: If you cannot provide at least 6 hours of direct sun, a grow light is necessary. Position it about 12 inches above the top of the cactus.

Why is my Peruvian torch cactus growing thin and leggy?