What is the Largest Elephant Ear Plant: A Quick Overview

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Elephant ear plants are known for their large, dramatic leaves that resemble the ears of an elephant. These tropical perennials come in various types, with some popular genera being Colocasia, Alocasia, and Xanthosoma. Not only do they add an eye-catching element to both indoor and outdoor gardens, but some of them also boast edible tubers, making them a versatile addition to any plant enthusiast’s collection.

Among the different elephant ear plants, the Colocasia gigantea ‘Thailand Giant’ is recognized as the largest. This striking plant showcases huge, heart-shaped, blue-green leaves that can grow up to 4-6 feet long and 3-5 feet wide. Its succulent leaf stalks provide sturdy support for the colossal foliage, making the Colocasia gigantea ‘Thailand Giant’ an architectural masterpiece that can create a lush, tropical atmosphere in any garden setting.

Largest Elephant Ear Plant Species

Colocasia Gigantea

Colocasia Gigantea
Thailand Giant Elephant Ear plant in the home garden. (Colocasia Gigantea)

Colocasia Gigantea, also known as ‘Thailand Giant’, is a tuberous, frost-tender perennial that boasts enormous, heart-shaped, blue-green leaves. The plant can have leaves that measure up to 4-6 ft. long (120-180 cm) and 3-5 ft. wide (90-150 cm), supported by strong, succulent leaf stalks. Native to Southeast Asia, it is also known as taro and is used in traditional Asian cuisine. However, it is important to note that all parts of the plant are poisonous when raw but become edible when cooked.

Alocasia Macrorrhizos

Alocasia Macrorrhizos
Photo of giant taro (Alocasia macrorrhizos) leaves in an ecopark in the Philippines.

Alocasia Macrorrhizos, also known as Giant Taro or Elephant’s-Ear plant, belongs to a genus of 80 species of tuberous, herbaceous perennials native to the tropical regions of Asia where rainfall is plentiful. It flourishes best in shaded sites with well-drained, humus-rich, fertile loam and tolerates a wide range of soil types. Alocasia Macrorrhizos is characterized by its large, dark green leaves which can grow up to several feet long, making it a desirable option for those seeking dramatic, lush foliage.

Xanthosoma Atrovirens

Xanthosoma Atrovirens
Micky mouse taro, Xanthosoma atrovirens, Family Araceae, Central of Thailand

Xanthosoma Atrovirens, another species of Elephant Ear plant, is known for its large leaves that can grow up to 3 ft. long and 2 ft. wide. It features dark green leaves with a glossy finish and long, slender leaf stalks. Native to tropical regions, Xanthosoma Atrovirens thrives in moist, well-drained soil and prefers partial shade to maintain its vibrant foliage. This species creates a stunning visual impact when included in gardens or used as a container plant for a touch of the tropics.

Growing Conditions and Care

Light Requirements

Elephant ear plants thrive in bright, indirect sunlight. Finding the right spot is essential for their vigorous growth and large leaf production. Avoid placing them in direct sun, as it can cause the leaves to burn and become crispy. You can grow these plants indoors near a bright window or outdoors in a partly shaded location.

Soil and Watering

When it comes to soil, elephant ear plants prefer a well-draining, fertile mix rich in organic matter. These plants love moisture and require consistent watering to prevent the soil from drying out. However, take care not to overwater, as it may lead to root rot. To maintain the desired level of moisture, it’s advisable to use a self-watering container or a tray with pebbles and water under the pot.

Temperature and Humidity

Elephant ear plants are tropical perennials that thrive in warm and humid conditions. They grow best in USDA hardiness zones 8 to 10, and can be overwintered in zone 7 with a thick winter mulch. Maintain a temperature range of 65-75°F for optimal growth. Since they love humidity, you can try placing a humidifier nearby or misting the leaves regularly if the air in your home or garden is dry.


To support their robust growth and large, showy leaves, elephant ear plants benefit from regular fertilization. Feed them every 4-6 weeks during the growing season, using a balanced, water-soluble fertilizer. Always follow the package instructions for the correct dosage. Additionally, incorporating organic matter, like well-aged compost or manure, into the soil can provide essential nutrients and improve the plant’s overall health.

Potential Health Benefits

Root and Stem Uses

Elephant ear plants, encompassing various genera such as Colocasia, Alocasia, and Xanthosoma, have been traditionally utilized for different medicinal and practical purposes. For instance, the tubers of certain species are known to be edible, providing a source of carbohydrates. However, it’s important to thoroughly cook them before consuming, as they contain calcium oxalate, which can cause oral irritation and throat swelling in high concentrations.

Additionally, the roots and stems of some elephant ear species reportedly possess antifungal, antibacterial, and anti-inflammatory properties. These plants are sometimes used in traditional remedies to treat skin infections, inflammation, and wounds.

Leaves and Their Uses

The leaves of elephant ear plants are not only striking in appearance but also offer some health benefits. Known for their air purifying capabilities, the plants are excellent at cleansing indoor air and removing pollutants, airborne allergens, and off-gases.

An interesting use of the leaves involves placing the large, water-repellant foliage under shelter roofs, where they can collect and direct rainwater away from vulnerable structures. Moreover, the leaves may be utilized as natural plates or food wrappers, offering an eco-friendly alternative to single-use plastic items.

In summary, elephant ear plants offer both aesthetic charm and potential health benefits. Their roots and stems can provide food and medicinal uses, while their leaves aid in improving air quality and offering practical applications. However, remember to always exercise caution when consuming or using any part of the plant for their purported health benefits.

Challenges in Plant Maintenance

Caring for the largest elephant ear plant, Colocasia gigantea ‘Thailand Giant’, can come with its own unique challenges. In this section, we will discuss some of the common pests and diseases that affect this plant, as well as their respective treatments.

Common Pests

Some of the common pests that can attack the ‘Thailand Giant’ include spider mites and aphids. Spider mites are tiny creatures that feed on the plant’s sap, causing the leaves to turn yellow and eventually die. To treat a spider mite infestation, you can:

  • Spray the plant with water to dislodge the mites
  • Use insecticidal soap or neem oil to kill the mites

On the other hand, aphids are small insects that also feed on plant sap and can cause the leaves to curl and distort. To eliminate aphids, you can:

  • Release beneficial insects, such as ladybugs and lacewings, to control the aphid population
  • Use insecticidal soap or neem oil as a treatment

Diseases and Treatment

Elephant ear plants can be susceptible to different diseases such as root rot and leaf spot. Root rot is a fungal infection that occurs when the plant is overwatered or left in poorly-drained soil. The roots become infected with fungi, causing them to rot and eventually killing the plant. To prevent root rot, make sure to:

  • Provide well-draining soil
  • Avoid overwatering the plant

Leaf spot is another fungal disease that causes brown or black spots on the leaves, eventually leading to the death of the foliage. To treat leaf spot, follow these steps:

  • Remove the infected leaves to prevent the disease from spreading
  • Apply a fungicide to the plant, following the manufacturer’s instructions

Frequently Asked Questions

How do elephant ear plants vary in size?

Elephant ear plants demonstrate a wide range of size differences across various species. They can be as small as 2 feet tall or as large as 10 feet tall. The size primarily depends on factors such as their origin, species, and growing conditions. Some varieties have larger leaves, while others have a more compact growth habit.

Which elephant ear plant grows the biggest?

Among the various species of elephant ear plants, the Colocasia gigantea, also known as Jack’s Giant, is known for having the largest leaves and achieving an impressive growth size. This particular species can grow up to 10 feet tall and have leaves reaching up to 5 feet in length.

What is Jack’s giant elephant ear?

Jack’s giant elephant ear is Colocasia gigantea, a large tropical plant known for its huge leaves that, in optimal growing conditions, can reach up to 5 feet in length. This impressive plant can grow up to 10 feet tall and creates a dramatic impact in any garden or landscape setting.

Can you grow giant elephant ears indoors?

Yes, giant elephant ear plants can be grown indoors, provided they have enough space and receive adequate light. They thrive in well-draining soil and prefer a humid environment similar to their native tropical habitats. Regular watering and an appropriately sized container are essential for their optimal growth.

Where can I buy giant elephant ear plants?

Giant elephant ear plants can be purchased from local nurseries, garden centers, or online retailers specializing in tropical plants. It is always advisable to buy from reputable sellers to ensure the highest quality and healthiest plants.

What is a Borneo giant elephant ear?

A Borneo giant elephant ear is an Alocasia, specifically Alocasia macrorrhizos ‘Borneo Giant’, known for its immense size and tropical appearance. This variety can grow up to 8-10 feet tall and its leaves can span over 4 feet in length. The Borneo giant is an ideal plant for creating a lush, tropical atmosphere in your garden or landscape.

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