Yellow leaves on sago palm: causes and fixes

Cycas revoluta

Quick answer

Yellow leaves on your sago palm have a few possible causes, and on this plant the likeliest is overwatering and early root rot.

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Toxic to pets

Most likely cause

Overwatering & early root rot

How to tell

The soil is still wet days after watering, the lower and oldest leaves yellow first, and the stem base may feel soft. Small dark flies around moist potting medium may be fungus gnats. They suggest conditions suitable for breeding, without proving that the surface never dries.

The fix

Stop watering. Make sure the pot can actually drain, and wait until the top 5 cm (2 in) of soil feel dry to the touch. If the base is mushy or smells sour, unpot it and trim any brown, soft roots before repotting in fresh mix.

Other possible causes

Not a match? Compare the signs below to find the one you have.

Too little light

How to tell

The yellowing comes with pale, stretched new growth leaning toward the nearest window. That combination shows that the spot is too dim for a sago palm.

The fix

Move it to a brighter spot, but keep it out of harsh midday sun, which scorches.

Thirst (underwatering)

How to tell

The soil is bone dry, and the yellowing arrives alongside crispy frond tips rather than soft, mushy growth.

The fix

If the soil is dry, water thoroughly (every 8 to 12 days in summer is the usual pace for a sago palm), then settle into feeling the soil before every watering rather than watering on a fixed day.

Hungry (but rarely the real culprit)

How to tell

Yellow, brown or distorted new fronds can indicate manganese deficiency. Uniform fading of old fronds is a different pattern. Check roots and growing conditions before choosing fertilizer.

The fix

Use a palm fertilizer containing manganese during active growth, according to the label. Confirm a suspected deficiency before adding extra manganese. Manganese and magnesium are different nutrients. Keep fronds that still have green tissue.

Simple old age

How to tell

A single bottom leaf slowly yellows while the rest of the plant looks healthy and is pushing new growth.

The fix

Nothing is wrong. Snip the spent leaf off and carry on. Plants retire their oldest leaves.

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Last reviewed: 2026-10-16