Aluminum Plant, Watermelon Plant (Pilea cadierei)

Aluminum plant (Pilea cadierei), also called watermelon plant, is a compact, bushy perennial prized for its striking silver-marked foliage. Native to Vietnam, it's a member of the Urticaceae family and a popular houseplant and terrarium subject.

Description

Grows 12–18 inches tall and wide with a mounding habit. Leaves are opposite, ovate, toothed, 2–3 inches long, dark green with two broad, raised, metallic-silver bands between the midrib and margin—resembling watermelon rind. Stems are succulent, brittle. Small, insignificant flowers rarely appear indoors.

Growing Conditions

• Zones: 11–12 outdoors; grown as houseplant/annual elsewhere.
• Light: Bright, indirect light. Direct sun scorches leaves; low light reduces silver markings.
• Soil: Well-drained, peaty potting mix.
• Water: Keep evenly moist; allow surface to dry slightly between waterings. Reduce in winter.
• Temperature: 65–75°F (18–24°C); avoid cold drafts.
• Humidity: High humidity preferred; mist regularly or use pebble tray.

Care & Maintenance

Pinch back regularly to maintain compact shape. Feed monthly with balanced liquid fertilizer in spring–summer. Repot annually in spring. Propagate easily from stem cuttings in water or moist mix.

Uses

Houseplants, terrariums, dish gardens, shaded patio containers. Combines well with ferns, fittonias, and other humidity-loving plants.

Potential Issues

Root rot from overwatering. Leaf drop from cold drafts or dry air. Spider mites in low humidity. Stems brittle—handle gently.

A small, dazzling foliage plant that lights up shady indoor spaces.