How often should I water my cactus?

Water every 7 to 14 days depending on the light and temperature. Always check the soil dryness first rather than sticking to a strict calendar.

Can I save a plant with root rot?

If you catch it early and remove the damaged roots, you can often save it. If the rot has reached the main stem, you might need to take healthy cuttings to propagate a new plant.

Why is my Rat's Tail Cactus turning mushy at the base?

Check these first

Press the base of the stems to see if they feel soft or hollow.
Stick your finger 2 inches into the soil to check for dampness.
Lift the pot to see if water is trapped in the saucer.

Likely causes

Overwatering
Most likely
How to tell: The base of the stems feels soft or squishy to the touch and may turn yellow or brown. The soil stays wet for more than 14 days.
What to do: Stop watering immediately and let the soil dry out completely. If the rot is advanced, remove the plant from the pot, trim away black or slimy roots, and repot in fresh, well draining cactus mix.
Poor drainage
Possible
How to tell: Water pools at the bottom of the pot or the soil remains heavy and dense. The plant does not seem to drink water even after a long time.
What to do: Ensure your pot has large drainage holes at the bottom. Use a porous terracotta pot to help moisture evaporate faster from the soil.

When to worry

If the stem is mushy all the way through or the rot has spread to the main body, the plant may be beyond saving. Firm, green stems are a sign of a healthy plant.

Stopping it coming back

Always let the top few inches of soil dry out completely before watering again. Use a gritty, fast draining soil mix designed for succulents.

Not sure which one it is? Photograph your rat's tail cactus.

This page lists the usual causes. Pocket Botanist looks at your actual leaf and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.

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Questions people ask

How often should I water my cactus?: Water every 7 to 14 days depending on the light and temperature. Always check the soil dryness first rather than sticking to a strict calendar.
Can I save a plant with root rot?: If you catch it early and remove the damaged roots, you can often save it. If the rot has reached the main stem, you might need to take healthy cuttings to propagate a new plant.