Eazy Gardening

Unleashing the Beauty of Black Stem Elephant Ear: Cultivation Care and Toxicity Management

Plant: Colocasia esculenta ‘Fontanesii’ (Black Stem Elephant Ear)Do you want a striking plant that adds a touch of the jungle to your garden? Look no further than Colocasia esculenta ‘Fontanesii,’ also commonly known as Black Stem Elephant Ear.

In this article, we will take a closer look at this magnificent plant, its characteristics, cultivation, and care. Overview of the Plant:

The Black Stem Elephant Ear is a tropical plant, known for its striking black stems and large, heart-shaped leaves that grow up to 3 feet in length.

This plant is native to Southeast Asia and the Pacific Islands, where it is grown for its edible tubers. The Black Stem Elephant Ear was first introduced to Europe in the 17th century and has since become a popular ornamental plant worldwide.


One of the most striking features of the Black Stem Elephant Ear is its dark, almost black, stems that make a stark contrast with its light green leaves. The leaves are thick and leathery and have a glossy appearance.

The plant can grow up to 6 feet in height, and its leaves can spread out to a width of up to 4 feet. In summer, the plant produces insignificant flowers that are usually hidden among the leaves.

The plant is also known for its benefit to wildlife, as it provides shelter and food for insects and small animals. Plant Cultivation and Care:

To get the best out of your Black Stem Elephant Ear, it is essential to understand its preferred growing conditions.

This plant prefers a warm, humid, and sheltered location, making it an ideal houseplant in cooler climates. It needs well-draining soil, rich in organic matter, and regular watering to prevent the soil from drying out.

This plant is also sensitive to cold and will not tolerate temperatures below 50F. Potential Pest and Disease Issues:

One of the common pests that may affect Black Stem Elephant Ear is spider mites.

These pests leave tiny webs on the undersides of leaves and cause leaves to yellow and eventually fall off. A good way to keep spider mites at bay is to hose down the leaves regularly to increase humidity and minimize dust and debris that may attract the pests.

Another common issue is fungal diseases like leaf spot or root rot, which can result from overwatering or damp soil. To avoid these issues, ensure that the plant is adequately watered and has good drainage.

Planting and Maintenance Tips:

Black Stem Elephant Ear is propagated through the division of clumps. When dividing clumps, ensure that each division has several tubers and plant it in a location with adequate space, light, and good drainage.

This plant requires regular feeding of organic fertilizer to promote growth and healthy leaves. Pruning is also an essential aspect of maintenance of Black Stem Elephant Ear.

Prune your plant in the fall to remove dead or damaged leaves and maintain a desirable size. Conclusion:

The Black Stem Elephant Ear is a magnificent plant known for its striking appearance and benefits to wildlife.

With its tropical charm, this plant can be planted in a garden or grown as an indoor plant to brighten up any space. By following the cultivation and care tips outlined above, you can enjoy the beauty of this plant for years to come.

Plant Propagation Methods:

Colocasia esculenta ‘Fontanesii’ is a plant that can be propagated using both sexual and asexual reproduction. Sexual reproduction involves the use of seeds, which can be produced by pollination of the plant’s flowers.

However, the Black Stem Elephant Ear’s seeds take a long time to germinate, and the resulting plants may not retain the same characteristics as the parent plant. Asexual reproduction, on the other hand, involves the use of vegetative propagation techniques such as division and cuttings.

Division involves separating the plant’s root ball into several sections, each containing tubers that can grow into new plants. This method is best done in spring before the growing season starts.

Cuttings, on the other hand, involve taking stem cuttings from the plant and rooting them in moist soil or water. This method is effective when done in summer when the plant is actively growing.

Propagation of Black Stem Elephant Ear should be done using sterilized tools to avoid introducing diseases to the new plants. Additionally, one should ensure that the new plants are planted in locations that have adequate space, light, and good drainage.

Plant Adaptations to Different Environments:

Plants, like animals, have different adaptations to cope with their respective environments. Colocasia esculenta ‘Fontanesii’ is a plant that has adapted to live in tropical environments, although it can be grown in many other regions.

Among its adaptations are:

1. Large leaves – Black Stem Elephant Ear has large leaves that provide shade for its roots, preventing them from drying out.

The leaves also play a critical role in photosynthesis, where they absorb sunlight and convert it into energy. 2.

Tubers – This plant has underground tubers that act as a storage facility for nutrients and water. This adaptation ensures that the plant can survive drought and other harsh conditions by tapping into reserves stored in the tubers.

3. Waxy leaf surface – Black Stem Elephant Ear has a glossy and waxy leaf surface that minimizes transpiration, a process where plants lose water through their leaves.

By reducing transpiration, this plant can conserve water during times of drought. 4.

Resilient stems – The Black Stem Elephant Ear has strong and resilient stems that can support the plant’s weight and withstand strong winds and heavy rainfall. To thrive, Black Stem Elephant Ear requires a well-draining soil that is rich in organic matter, consistent watering, and humid conditions.

In areas with cold temperatures, the plant may become dormant and die back in winter, only to emerge again during the warmer seasons. Conclusion:

Propagation techniques and adaptations are two essential aspects of understanding plants’ biology, including Colocasia esculenta ‘Fontanesii.’ Asexual propagation methods such as division and cuttings are more reliable for propagating this plant than sexual reproduction.

Black Stem Elephant Ear has developed several adaptations to survive in its native tropical environments, such as large leaves, underground tubers, a waxy leaf surface, and strong stems. Understanding these adaptations inform proper care and maintenance of the plant and lead to a more enjoyable gardening experience.

Usage of the Plant in Indoor Setting:

Colocasia esculenta ‘Fontanesii’ can be grown as a houseplant in indoor settings, provided that the conditions are favorable. As a tropical plant, it thrives in high humidity, warmth, and low light conditions.

In indoor settings, a well-draining potting mix with peat or sphagnum moss can replicate the natural growth environment. Potting the plant in a container ensures that it stays confined and can be moved around to different locations easily.

One of the benefits of growing Black Stem Elephant Ear indoors is its air-purifying qualities. This plant purifies the air by absorbing toxins such as formaldehyde, benzene, and carbon monoxide, making it an ideal indoor plant for people with asthma and allergies.

The plant’s lush green foliage adds to the aesthetic value of indoor spaces, making them more vibrant and aesthetically pleasing. When growing this plant indoors, it is crucial to avoid overwatering that can lead to root rot.

Adequate drainage and regular watering are essential. To increase humidity around the plant, one can place a tray of water next to the plant.

Usage of the Plant in Outdoor Setting:

Black Stem Elephant Ear is an excellent plant for outdoor settings, thanks to its tropical beauty and low maintenance requirements. This plant is ideal for adding dramatic foliage to a garden or as a standalone feature plant.

When planting Colocasia esculenta ‘Fontanesii,’ it is crucial to ensure that the soil is fertile and well-draining. The ideal soil pH for Black Stem Elephant Ear is between 5.5 and 6.5.

When cultivating this plant in an outdoor setting, it is best to provide a regular watering schedule and apply fertilizers to ensure optimal growth.

Adequate spacing allows air circulation around the plant, reducing the risk of fungal infections. The plant thrives in full sun or partial shade, making it an excellent option for underutilized garden spaces.

A significant benefit of planting Black Stem Elephant Ear outdoors is its potential to attract beneficial insects and small animals. This plant is an important food source for butterflies, bees, and hummingbirds.

It also provides shelter for small animals such as mice and insects. When cultivating Black Stem Elephant Ear outdoors, it is essential to monitor closely for pesky pests.

Spider mites, mealybugs, and aphids can be common problems that affect the plant’s foliage. Early identification and treatment of pests are vital to prevent the spread of infestations.


Colocasia esculenta ‘Fontanesii’ is a versatile plant that can thrive both indoors and outdoors. Its striking green leaves and dark stems make it an attractive feature plant in any landscape or living space.

Providing the ideal growing conditions and adequate pest management contributes to maintaining optimum growth and minimizing the risk of plant damage. Whether used in outdoor or indoor settings, Black Stem Elephant Ear is an excellent addition to any garden or living space.

Toxicity of the Plant to Pets and Horses, Humans:

While Colocasia esculenta ‘Fontanesii’ is not considered highly toxic to humans, it can be toxic to pets and horses. The plant contains oxalates, which can cause irritation and inflammation in the mouth, digestive system, and skin if ingested.

Symptoms of toxicity in pets and horses include excessive drooling, vomiting, diarrhea, difficulty swallowing, and skin irritation. It is essential to keep pets and horses away from Black Stem Elephant Ear and other toxic plants.

If you suspect your pet or horse has ingested part of this plant, seek veterinary attention immediately. Humans can also experience some discomfort when handling the plant.

The sap from the leaves can cause skin irritation and may lead to the development of skin rashes and blisters. When handling the plant, it is advisable to wear gloves and long-sleeved clothing to reduce irritation.

Proper handling and care of Black Stem Elephant Ear can reduce toxicity risks to humans and animals. It is also essential to keep the plant out of reach of children who may unknowingly ingest it.


While Colocasia esculenta ‘Fontanesii’ is not considered highly toxic to humans, it can cause harm to pets and horses. This plant’s toxicity stems from the presence of oxalates, which can cause irritation and inflammation in pets and horses.

Proper handling and care can reduce the risks associated with this plant. It is important to keep toxic plants out of reach of pets and children who may unknowingly ingest them.

In conclusion, Colocasia esculenta ‘Fontanesii’ is a magnificent plant that adds a tropical touch to any indoor or outdoor setting while also providing benefits to wildlife. With its striking appearance and air-purifying qualities, it is an ideal plant for any home or landscape.

Understanding the plant’s preferred growing conditions, propagation, and toxicity management is essential in ensuring its optimal growth and reducing risks associated with its toxicity. By following the care tips outlined and taking measures to keep toxic plants out of reach of pets and children, one can enjoy the beauty of Black Stem Elephant Ear while minimizing risks to their health and the health of their animals.


1. Is Colocasia esculenta ‘Fontanesii’ easy to grow indoors?

Answer: Yes, provided that the plant’s preferred growing conditions are met, such as high humidity and warmth. 2.

What are the plant’s benefits? Answer: Black Stem Elephant Ear is an air-purifying plant that improves the air quality and aesthetic appeal of indoor spaces.

It also supports beneficial insects and small animals. 3.

What adaptations does Black Stem Elephant Ear exhibit? Answer: The plant has large leaves, underground tubers, a waxy leaf surface, and strong stems as adaptations to survive tropical environments.

4. How can one propagate Colocasia esculenta ‘Fontanesii’?

Answer: This plant can be propagated through division and cuttings. 5.

What is the toxicity level of Colocasia esculenta ‘Fontanesii’? Answer: While not highly toxic to humans, Black Stem Elephant Ear can be toxic to pets and horses due to the presence of oxalates.

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