7 Reasons Your Cactus is Turning Yellow and How to Fix It

Cacti (Cactus), known for their hardiness and unique charm, are favored additions to indoor plant collections. However, the misconception that these low-maintenance succulents can thrive with neglect is far from the truth. If you’ve noticed your vibrant green cactus taking on a yellow hue, it’s a clear signal that adjustments in care are needed.

Identifying the Culprits

1. Improper Watering

Cacti, being drought-tolerant, are prone to yellowing if overwatered. A brown base and yellow upper stem suggest drowning. Conversely, dehydration can also induce yellowing. The key is finding the right balance.

Suggested Solution

Allow the potting soil to thoroughly dry between waterings. Wrinkling or thinning stems indicate it’s time for a drink, preventing severe dehydration and potential root death.

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2. Inappropriate Light

Cacti thrive in sunlight but can suffer from sunburn, leading to yellow spots. It’s crucial to provide the right amount of light tailored to each species.

Suggested Solution

Use a shade cloth for indirect bright light, especially during intense sun periods. Gradual acclimation to sunny spots is also advisable.

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3. Poor Drainage

Standard potting soil won’t cut it for cacti. They demand a fast-draining medium to avoid root rot and yellowing.

Suggested Solution

Opt for a cactus soil mix: three parts potting soil, three parts sand or gravel, and two parts perlite or pumice.

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4. Nutrient Deficiencies

Indoor cacti may suffer from nutrient deficiencies, causing yellowing. Repotting and using a nutrient-rich mix can aid absorption.

Suggested Solution

Repot rootbound plants and fertilize indoor varieties monthly during the growing period with a phosphorus-rich cactus fertilizer.

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5. Pest Problems

While cacti are resistant to many pests, infestations can lead to yellow spots. Regular inspection and prompt action are vital.

Suggested Solution

Use water, neem oil, or insecticidal soaps to eliminate pests. Swift action prevents a minor issue from becoming a full-blown infestation.

6. Transplant Shock

Minimize stress during transplanting to avoid transplant shock, a common cause of yellowing in cacti.

Suggested Solution

Gently acclimate to bright conditions, minimize root disturbance, and delay watering for a week to let the roots settle.

7. Freeze Damage

Exposure to cold snaps can cause yellowing, with prolonged exposure leading to plant death.

Suggested Solution

Protect your cactus during cold snaps by overwintering indoors or in a greenhouse.

Frequently Asked Questions

What does an overwatered cactus look like?

An overwatered cactus exhibits yellowing on the stem, accompanied by a mushy and drooping appearance. Cut back on irrigation to address this issue.

How often do you water a yellow cactus?

Allow the yellowing cactus to dry out before adjusting to a conservative watering regime. The frequency varies based on species, home conditions, and the season.

Can you revive an overwatered cactus?

Reviving an overwatered cactus depends on the severity of root rot. If caught early, chop off affected roots and repot in well-draining soil. However, extensive damage may be irreversible.

In Summary: Understanding the reasons behind your cactus turning yellow is the first step towards nursing it back to health. Tailoring care to each aspect, from watering to light exposure, ensures a thriving and vibrant cactus.