Cast Iron Plant

Aspidistra elatior · Houseplant

Quick answer: Water: About every 2 weeks, when the top 2 in is dry (estimated); when the top 2 in of soil is dry (estimated). Light: Low to medium, indirect light; avoid direct sun. Soil: General potting mix with good drainage; tolerates a wide pH range. Pets: Listed by ASPCA as non-toxic to cats and dogs. Large amounts of leaf may still upset the stomach. If in doubt, ask your vet.

Earned its common name by surviving dim corners, dry air and irregular care. It grows slowly from underground stems, sending up long, dark green leaves. A good choice for low-light rooms and hallways.

Care at a glance

Light

Low to medium, indirect light; avoid direct sun

Water

When the top 2 in of soil is dry (estimated)

Soil

General potting mix with good drainage; tolerates a wide pH range

Temperature

Best 50–75 °F (estimated); indoors keep above about 40 °F; outdoors hardy in zones 7–11

Pot size

Wide pot 1–2 in larger than the clump

Container

Pot with drainage holes; repot every 3–4 years

Growth

Slow; a few new leaves per year

Lifespan

Perennial; decades with basic care

When?

Divide or repot in spring, when new shoots start to appear. Outdoors it can be planted in deep shade where it is hardy, roughly USDA zones 7–11 (winter lows down to about 0 °F).

Step by step

1. Choose a wide pot with drainage holes; it spreads sideways.
2. Fill with a standard potting mix and plant at the same depth as before.
3. Place in a shaded spot away from direct sun, which scorches leaves.
4. Water when the top 2 in is dry; water less in winter (estimated).
5. Feed lightly every 1–2 months in spring and summer.
6. Dust the leaves with a damp cloth to keep them glossy.
7. Cut damaged leaves at the base; new ones grow from the soil.
8. Divide large clumps in spring, keeping several leaves per piece.

Common problems

Pets

Listed by ASPCA as non-toxic to cats and dogs. Large amounts of leaf may still upset the stomach. If in doubt, ask your vet.

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