Plant guide:ðŋ Colocasia (Taro / Elephant Ear)
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Nutrients
Nutrient Deficiency Yellowing in Colocasia
Commonly affects: Colocasia esculenta (Taro / Elephant Ear)
Leaves turn pale yellow-green overall, or develop yellowing between the veins while veins themselves stay green, distinct from simple old-leaf senescence.
Potential Causes
- 1Nitrogen deficiency causing overall pale, yellow-green colouring, especially likely given Colocasia's fast growth and heavy nutrient demands
- 2Iron deficiency causing interveinal yellowing (veins green, tissue between them yellow), sometimes linked to soil pH
- 3Depleted potting mix that hasn't been fed adequately for this fast-growing plant
Solution Steps
- 1Feed regularly with a balanced, nitrogen-rich fertiliser during the growing season to support this fast-growing plant's demands
- 2Apply a chelated iron supplement if interveinal yellowing (green veins, yellow tissue) specifically is present
- 3Check soil pH if iron deficiency symptoms persist despite feeding, since overly alkaline soil limits iron availability
- 4Repot into fresh potting mix if it's been a long time since the last repot
Prevention Tip
The specific yellowing pattern matters â overall pale colour points to nitrogen deficiency, while green veins with yellow tissue between them points to iron deficiency.
