Pilea 'Silver Tree' (Pilea spruceana 'Silver Tree') problems — and how to fix them

Soggy, airless soil is the most common cause of death. Leaves yellow and stems collapse at the base. Let the top inch dry between waterings, use a free-draining mix and a pot with drainage, and never leave it standing in water.

Usually a sign of low humidity or the soil drying out completely, especially in heated winter rooms. Raise humidity with a pebble tray, humidifier or terrarium and keep watering even rather than letting it bone-dry.

Too little light dulls the silver banding and stretches the stems. Move it to brighter indirect light (out of harsh direct sun) and pinch the tips to encourage a fuller, more compact, well-coloured mound.

Dry indoor air invites spider mites, which cause fine stippling, dull leaves and faint webbing. Rinse the foliage, raise humidity, isolate the plant and treat with insecticidal soap or neem, repeating to break the life cycle.

Watch for white cottony mealybugs in leaf joints, plus aphids and scale. They sap vigour and leave sticky honeydew. Dab mealybugs with an alcohol-dipped cotton bud and treat with insecticidal soap or neem, inspecting regularly given the dense growth.

Cold draughts, a sharp temperature swing, or letting the plant dry out severely can trigger leaf drop. Keep it in a stable 18-24C spot away from cold windows, radiators and heating vents, and maintain even moisture.