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Yellow leaves on Hoya obovata: causes and fixes

Quick answer

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

Hoya obovata
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Pet safety unknown

First, check the soil. Push a finger 2 to 3 cm (0.8⁠–⁠1.2 in) into it and lift the pot. Dry and light means thirst. Wet and heavy means too much water or poor drainage.

Most likely cause

Overwatering & early root rot

Pixel illustration of water being poured out of a saucer into a bowl

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.

The fix

  1. 1
    Water according to moisture, only when the top 3 cm (1.2 in) of soil feel dry.
  2. 2
    Check drainage and do not add water just because a tip is brown or a calendar says it is time.
  3. 3
    Remove rotten roots and replace soggy mix.
More about this

They suggest conditions suitable for breeding, without proving that the surface never dries.

For rescue cuttings, wear gloves against irritant sap and use healthy stem tissue with a node. Allow the cut to callus, then root in airy, lightly moist medium. A lone leaf without a node cannot make a new vine.

Other possible causes

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

Too little light

The yellowing comes with pale, stretched new growth leaning toward the nearest window.

The fix

  1. 1
    Move it to a brighter spot, but keep it out of harsh midday sun, which scorches.
More about this

That combination shows that the spot is too dim for a Hoya obovata.

Thirst (underwatering)

The soil is bone dry, and the yellowing arrives alongside wrinkled round leaves rather than soft, mushy growth.

The fix

  1. 1
    If the soil is dry, water thoroughly (every 6 to 10 days in summer is the usual pace for a Hoya obovata), then settle into feeling the soil before every watering rather than watering on a fixed day.

Hungry (but rarely the real culprit)

Hoya obovata grows slowly and needs very little feeding, so a uniform pale-yellow fade after many months without any is possible, but check watering and light first: those are far more common on this plant.

The fix

  1. 1
    Use a balanced liquid fertilizer at half the strength on the label, about every 14 days while it’s actively growing.
  2. 2
    Overfeeding a slow grower like this does more harm than skipping it.

Simple old age

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

The fix

  1. 1
    Nothing is wrong.
  2. 2
    Snip the spent leaf off and carry on.
  3. 3
    Plants retire their oldest leaves.

All Hoya obovata guides

Keep reading

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