How to Grow and Care for Cast Iron Plant

True to its name, the cast iron plant (Aspidistra elatior) has earned a reputation for being a no-nonsense, hard-to-kill houseplant. It's a great plant for low light conditions, tolerates a range of indoor temperatures, and puts up with irregular watering. It also grows well outdoors in its growing zones and is a popular choice for containers and shade gardens.

The cast iron plant has arching, lance-shaped, deep green leaves that can reach around two feet long and four inches wide. Native to areas across Japan and China, this slow-growing plant is prized for its lush foliage and low-maintenance nature, although it can produce insignificant white blooms when grown outdoors.

Here's everything you need to know about how to grow and care for the hardy cast iron plant.

Common Name	Cast iron plant, bar room plant
Botanical Name	Aspidistra elatior
Family	Asparagaceae
Plant Type	Perennial, herbaceous
Mature Size	2–3 ft. tall, 1–2 ft. wide
Sun Exposure	Partial, shade
Soil Type	Well-drained
Soil pH	Acidic, neutral
Bloom Time	Spring, summer
Flower Color	White, purple
Hardiness Zones	8–10 (USDA)
Native Area	Asia

Cast Iron Plant Care

• Allow the soil to dry out between waterings.
• Keep in indirect sunlight, indoors or outdoors.
• Use any kind of soil, as long as it's well-draining.
• Keep the plant in temperatures between 60°F to 75°F indoors and outdoors.

Light

Cast iron plants are popular as low-light houseplants because they can tolerate a range of different light conditions; however, they will grow best in medium to bright indirect light.

Be sure to keep cast iron plants away from direct sunlight, which can bleach and burn the leaves. When growing cast iron plants outdoors, place them in a shady area with indirect sunlight.

Soil

These hardy plants tolerate a wide range of soils, as long as they have good drainage. Theyprefer organically rich soil with a slightly acidic to neutral soil pH.

Outdoors, they can grow in sandy, loamy, and even clay soils. For container plants, simply buy a standard quality potting mix.

Water

Be cautious of overwatering cast iron plants. While they are known for being hardy, their roots can be quite sensitive and can not tolerate sitting in wet soil.

A good rule of thumb for houseplants and container plants is to allow the soil to dry completely between waterings, and then water well. allowing the excess water to drain from the pot's drainage holes.

Temperature and Humidity

Cast iron plants prefer temperatures between 60°F and 75°F. They are not hardy to cold, and temperatures that drop below 50°F can damage or kill them. So if you're growing your plant in a container outdoors, be sure to take it inside well before the threat of frost.

For the most part, standard household humidity levels are adequate for cast iron plants, although if your home is overly dry your plant may benefit from some added humidity.

Fertilizer

Feed your cast iron plant once a month with an all-purpose liquid fertilizer during the spring and summer months or use a slow-release fertilizer in the spring.

It's not necessary to fertilize during the fall and winter months. Only apply fertilizer after watering the plant to avoid burning the roots.

Types of Cast Iron Plants

Cast iron plants can have variegated foliage from cream or white stripes, streaks, or spots to yellow and white dots. There are several varieties of cast iron plants, including:

• 'Variegata': This cultivar features green leaves with white stripes.
• 'Asahi': This variety's green leaves develop white tips as they grow.
• 'Hoshi-zora': This plant's name translates to starry sky, and its green leaves are speckled with yellow to white dots.
• 'Lennon's Song': The leaves on this variety have light green or yellow stripes.
  

Is This the Right Plant for You?

A CAST IRON PLANT IS A GOOD CHOICE FOR YOU IF:

• You want an easy-to-care-for houseplant.
• You want a houseplant that's slow growing, so you won't have to repot it for a couple of years.
• You have pets and are looking for an attractive, non-toxic houseplant.

Propagating Cast Iron Plants

It's best to propagate cast iron plants during spring or the early summer months when the plant is actively growing, but this can technically be done at any time of the year. Follow these simple steps to propagate a cast iron plant by division:

1. Remove the whole plant from its pot so you can see all of the rhizomes and roots.
2. Identify where you would like to divide your plant and separate the rhizomes and roots. Use your hands to gently pull the rhizomes apart at the base if possible. It's a good idea to have a sharp knife or pruning shears at the ready in case you need to cut apart a few larger chunks of the rhizome. Note that each divided piece should have at least two or three leaves of its own to help it get established.
3. Plant the freshly divided cast iron plan in a separate pot that has drainage holes and is filled with fresh potting mix. If you are growing your plant outdoors, you can plant these divided pieces directly in the ground.
4. For the first couple of weeks, keep the soil lightly moist as the propagations adjust to their new containers. Then begin cutting back on watering until you are allowing the plant to dry out completely between waterings, as usual.

Potting and Repotting Cast Iron Plants

Repotting is usually only necessary once every few years since cast iron plants are known for being slow-growing. Once you see roots growing from your pot's drainage holes or circling the inside of the container, it's time to repot.

If possible, wait until the spring or summer months to repot your cast iron plant as it is actively growing in these months and can handle the disruption to its environment more easily. Additionally, it's best to repot once your plant is ready to be watered since watering the plant in its new pot can help it settle.

Follow these steps to repot a cast iron plant.

1. Take your plant out of its pot and brush away as much of the old soil as possible without breaking roots.
2. Choose a new container that is one size up (two to four inches larger in diameter than the last).
3. Place your plant in its new pot and fill in the excess space with fresh, well-draining potting soil.
4. Return the plant to its original location and water thoroughly, allowing the excess water to drain from the pot.

Common Pests and Diseases

Cast iron plants do not often succumb to pest or disease problems, especially when grown in their natural environment.

As houseplants, however, they are susceptible to common houseplant pests, including mites and scale. Rinsing the foliage can help to dislodge the pests and control a minor infestation. For more severe infestations, consider an insecticidal soap or horticultural oil.

As far as diseases go, the main one to watch out for is root rot. This is usually only a problem for cast iron plants that are grown in containers—both indoors or outdoors.

Root rot often results from overwatering and improper drainage (i.e. no drainage holes in the pot or overly dense soil). Watch out for mushy stems and roots which are an indication your plant is suffering from root rot.

Common Problems With Cast Iron Plants

Cast iron plants have very few problems as long as they're grown in their preferred conditions. But some common issues can arise when the environment isn't to their liking.

Browning Tips

Brown leaf tips are commonly due to overwatering or underwatering, especially with cast iron plants grown in containers. Always check the soil moisture before watering, and wait to water until the soil is dry a few inches down. Also, ensure that excess water can drain out of the container.

Leaves Turning Brown

Parts of or even entire leaves turning brown on cast iron plants can often be the result of too much sunlight. Check your plant throughout the day to make sure direct sun is never hitting it, and relocate it if necessary.

Drafts indoors, especially from air-conditioning vents, and cold temperatures outdoors also can cause browning foliage. Make sure your plant is protected from temperature extremes.

Drooping Leaves

A cast iron plant's leaves may droop if it is too dry. Though this plant likes soil more on the dry side, you may need to give it a drink to perk it up.

From: thespruce