Philodendron Silver Sword problems — and how to fix them

Soggy soil causes yellowing leaves, mushy stems and a rotting smell. Let the top 1-2 inches dry out, use a chunky well-draining mix, and ensure the pot has drainage holes.

In too little light the metallic sheen dulls and stems stretch with small leaves and long gaps between them. Move to brighter indirect light and provide a moss pole to encourage larger leaves.

Thrips, spider mites, mealybugs, aphids and scale can infest it, causing stippling, webbing or sticky residue. Inspect regularly and treat with insecticidal soap or neem oil, isolating the plant until clear.

Usually low humidity, underwatering, or fertiliser salt buildup. Raise humidity above 60%, water more consistently, and flush the soil periodically to remove excess salts.

Direct sun bleaches and burns the foliage. Pull the plant back from hot windows into bright, filtered light.

Wet foliage in poor airflow can develop dark or yellow-haloed leaf spots. Water at the soil line, avoid wetting leaves, and improve air circulation.