Why does your Zantedeschia Red Alert have brown leaf tips? Diagnose the cause and fix it with our step-by-step guide.
Calla Lilies thrive in humid environments; dry indoor air causes the delicate edges of the leaves to desiccate and turn brown. This is particularly common when the plant is kept near heating vents or air conditioning units.
Excessive buildup of mineral salts from tap water or over-fertilizing can cause osmotic stress, leading to scorched leaf tips. 'Red Alert' cultivars are sensitive to high salt concentrations in the growing medium.
Allowing the rhizome to dry out completely between waterings causes stress that manifests as brown, crispy tips. Conversely, if the soil stays too saturated, it can lead to early-stage root decay affecting moisture transport.
High moisture levels combined with poor air circulation can allow fungal pathogens to attack the foliage. This often starts as small brown spots that eventually expand to the leaf margins.
Your plant might also be experiencing one of these issues:
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