Alocasia Wentii ‘New Guinea Shield’ Care Guide (2022)

Alocasia Wentii ,Alocasia plant

Alocasia wentii is a big, splashy plant that can bring a touch of the tropics to any space.

It’s also called New Guinea Shield or Hardy Elephant Ear.

This giant-leaved houseplant will thrive as long as you can give it the rainforest conditions that it loves- warmth, humidity, and dappled sunlight.

Scientific NameAlocasia wentii
Common NameHardy Elephant Ear, New Guinea Shield, Purple Umbrella
LightBright indirect sunlight
WateringWeekly, water if the top 2 inches of soil is dry
Temperature59-86°F (15-30°C)
Hardiness Zone8a to 10b
Humidity60-80%
Soil TypeRich, quick-draining, loamy
Soil pH6.1- 7.3 (slightly acid to neutral)
FertilizingA balanced feed once a month in spring and summer
RepottingEvery 2 years
PruningBeginning of the growing season
PropagationDivide offsets 
ToxicityToxic to humans and pets
Mature Size5 feet as a houseplant
Bloom TimeRarely blooms

What’s Unique About Alocasia wentii?

Alocasia wentii plants were first discovered in the early 1900s in Borneo. Like all Elephant Ears varieties, they are native to the rainforests of Southeast Asia where they grow on the forest floor.

Alocasia wentii is prized for the size and beauty of its leaves, which can grow to a foot in length. They are glossy green on top with a striking purple underside.

Growing Alocasia wentii is easy enough for even an inexperienced gardener, and is more forgiving of cooler temperatures than most tropical plants.

The plant is not only beautiful but will filter contaminants from the air for a healthier indoor environment.

Alocasia wentii Care

Alocasia wentii plant care boils down to providing this plant with its roots in the tropical rainforests with similar conditions in your home.

That doesn’t mean you have to turn your house or apartment into a steamy jungle. 

However, the closer you can get to the ideal New Guinea Shield care, the happier and healthier your Alocasia wentii will be.

Light 

The Alocasia wentii plant is a hybrid Elephant Ear which originates in the rainforests of the South Pacific.

As a result, New Guinea Shield light needs are for the dappled sunlight that is found beneath the tree canopy in those tropical forests. That translates to 10,000-20,000 lux.

To best supply Alocasia wentii light requirements, place in a spot with bright but indirect light.

An Alocasia wentii will grow quite well close to the window of a north or east-facing room, but in a room with south or west exposure keep it out of full sun.

Too much sun can damage the leaves and inhibit the growth of Alocasia wentii.

Watering 

In the rainforests of the South Pacific, rainfall is frequent but the porous soil drains well, creating a moist but never saturated growing medium.

It’s fairly easy to fulfill those watering needs for your potted Alocasia wentii.

Rather than following a schedule for your Alocasia wentii watering, monitor the soil moisture and only water New Guinea Shield when the top couple of inches of the soil are dry.

Water from the top of the soil with a gentle stream, stopping when water starts coming out of the drainage holes at the bottom. 

Do not let the pot sit in the collected water, as it can lead to root rot.

Temperature 

The ideal Alocasia wentii temperature range is between 55-85 (13-30ºC).  Their temperature tolerance extends to about 95ºF (35ºC)

In the wild, Alocasia wentiis grow at higher elevations on mountainsides. This means that they have a bit more hardiness than many other tropical plants, but sustained temperatures below 50ºF (10ºC) will trigger dormancy.

Most homes can easily provide a good temperature for New Guinea Shield. Just be sure to keep them out of the way of air conditioning vents or fans.

Moving your outside in summer will expose it to temperatures at the high end of its preferred range. However, bring them in before cold weather. While temperatures slightly below freezing may not kill the plant, it will cause damage to the foliage.

Humidity 

Rainforests are humid places, and as can be expected, Alocasia wentii humidity requirements are pretty high. 

The ideal humidity for New Guinea Shield is between 60-80%. 

That high a humidity level is not really possible or desirable in a house. However, you can create a humid microclimate for your Alocasia wentii and other humidity-loving houseplants.

Place your tropical plants on a large pebbled tray that you keep filled with water. As it evaporates it will moisten the air around the plants.

Another alternative is to purchase a small humidifier to place in their midst.

Directly misting the leaves is not recommended as too much water can cause disease.

Soil 

The best Alocasia wentii soil retains moisture while at the same time being well-draining. 

The ideal pH level for New Guinea Shield is between 6.1-7.3 (mildly acidic to neutral)

The best commercial soil mix to use for Alocasia wentii is one specifically for aroids, which you should be able to find online.

However, if you need to mix your own soil for New Guinea Shield, you should be able to find the ingredients at any nursery.

Combine equal parts of potting soil, perlite, and peat moss or coco coir. If you substitute a good compost mix for the potting soil your Alocasia wentii will get more nutrients and need less fertilizing. 

Fertilizer 

Your Alocasia wentii will need fertilizer to maintain the lush appearance of its massive leaves.

The best fertilizer for New Guinea Shield is a liquid indoor plant fertilizer with a balanced fertilizer ratio of 10-10-10.

Use your Alocasia wentii fertilizer every few weeks during the spring and summer, and stop as it enters dormancy in fall and winter.

Dilute the liquid fertilizer with twice as much water as recommended, and pour it gently over the soil surface. Make sure the soil is uniformly moist so that the nutrients will stay in the soil instead of running out the bottom of the pot.

Potting & Repotting 

While Alocasia wentii doesn’t mind a bit of crowding in its pot, consider repotting New Guinea Shield every two years at the most.

When you see roots growing out the drainage holes, or small plants popping up around the edges of the plant, it’s time for Alocasia wentii repotting.

Do not move your Alocasia wentii into a much bigger pot; go up by only 2 inches in diameter. Too big a pot size will actually stress the plant. Make sure it’s got good drainage holes.

Pull off any offsets around the mother plant and pot them separately.

Use fresh potting mix and water well, letting the excess water drain out. 

Pruning 

Your Alocasia wentii will not require much pruning. For the most part, the only time cutting New Guinea Shield is necessary is to remove dead or damaged leaves.

Since the leaves are large, leaving even one in less than ideal condition will detract from the overall appearance of the plant, so be prepared to trim these leaves off as they occur. 

For Alocasia wentii pruning, use a sharp, sterilized knife or pair of scissors, and cut the stem out as close to the soil surface as possible. Be careful not to cut into stems supporting healthy leaves.

You may also choose to cut out lower leaves to keep the foliage out of the reach of pets and children.

Propagation 

The easiest method of Alocasia wentii propagation is through division at the same time that you are repotting.

It is possible to propagate New Guinea Shield by taking cuttings. However, the offsets that develop next to the mother plant will grow into good-sized specimens much faster. A stem cutting has to create a whole new root system to support growth.

When you have removed the root ball from the pot, you should be able to see where these new baby plants have developed. Gently pull them away, and pot each one in its own small pot. If necessary, use a sterilized knife to divide the clump.

Also, make sure to check out our in-depth Alocasia black velvet plant care guide.

Common Problems of Alocasia wentii

Like with any houseplant, you will need to keep an eye out for pests and disease. However, most problems with New Guinea Shield are easy to prevent or control.

Alocasia wentii problems can include common insects such as spider mites, while diseases are usually the result of overwatering.

Regular inspection of the Alocasia wentii leaves is the best way to keep on top of potential problems.

Pests 

The three most likely Alocasia wentii pests are spider mites, thrips, and mealybugs.

Spider mites leave small yellow or white spots on the leaves. If you have a serious infestation you may see sticky webbing. You can usually control them with an insecticidal soap spray.

If your New Guinea Shield leaves have cottony clumps on the underside of the leaves, you have mealybugs. Regular applications of neem oil over the top and bottom of each leaf will keep them at bay.

The other bugs that you may find on your Alocasia wentii are thrips, which are tiny flying insects. Use neem oil or pyrethrin spray to control them. 

Diseases 

Alocasia wentii diseases are usually caused by too-wet soil conditions, so the best way to avoid them is by keeping the soil moist but not sopping wet.

However, if your New Guinea Shield has developed a fungal disease, you may be able to bring it back to health.

The first symptoms of root rot are yellowing leaves and mushy stems. If the soil is saturated with water, remove the plant and cut away all blackened roots and affected foliage. Repot in fresh soil mix and avoid overwatering.

Leaves may develop yellow, brown or black spots that are signs of a fungal infection. Cut away all diseased leaves at the soil level. Use a fungicidal spray to treat any remaining pathogens and cut back on watering.

Growing Problems 

Most Alocasia wentii growing problems occur when you try to grow this tropical rainforest native without giving it the optimal conditions for healthy growth.

If you’ve got a sick plant, start by seeing how you can improve its environment.

Drooping leaves may indicate too much or too little soil moisture. Either water it more or less, depending on what you find when you check the pot.

If the leaves are developing brown tips, they need a higher humidity level. Create a moister microclimate with a small humidifier or pebble tray.

If the leaves look scorched, they’re getting too much sun. Move your Alocasia wentii to a shadier spot or shade it with a light curtain.

Toxicity of Alocasia wentii

New Guinea Shield is toxic to all mammals. All parts of the plant contain calcium oxalates.

Its toxicity level is not usually fatal but can cause serious reactions in humans and pets.

If you want to grow an Alocasia wentii in a home with children or pets, it’s best to take precautions to prevent ingestion of plant material.

For Humans

All parts of Alocasia wentii are toxic to humans. 

Children are more likely to try a bit of an Alocasia wentii leaf, but since the plant  has an unpleasant taste they’re unlikely to eat much.

Clean off any plant material around or inside their mouth. If they complain of pain around their mouth, give them something cool like a popsicle to soothe the sensation. However, if they have a swollen tongue or difficulty breathing take them for emergency care immediately.

You may get a skin irritation from exposure to the plant’s sap. Rinse the area thoroughly and use a topical cream to soothe any rash that develops.

For Pets

Pets such as cats, dogs, and rabbits can all suffer adverse reactions from ingesting Alocasia wentii foliage or stems.

The best preventative measure is to keep your Alocasia wentii out of reach of your family’s pets. A small plant can be kept on a high shelf. A more mature plant can be fenced off at floor level, or trimmed so that all foliage is high up on the plant. 

However, if you do suspect that your pet has eaten some foliage, and they are drooling, wheezing, or vomiting, you should take your pet to the veterinarian as soon as possible. 

Alocasia wentii Appearance

The striking Alocasia wentii appearance is the main reason this rare tropical beauty is so desirable.

Like all Elephant Ears, New Guinea Shield is notable for its huge leaves which will dominate any space in which it is placed.

The graceful shape that Alocasia wentii naturally develops will be a strong architectural element in any decor.

Foliage

The foliage of Alocasia wentii is stunning in both shape and color.

On a fully mature plant, each leaf can grow to a size of up to 2 feet long, and half that in width. The leaves of juvenile plants will get to about a foot long.

The leaves are heart or shield-shaped with a distinct tip. Lustrous green on top, their undersides are an attractive bronze-purple. 

The leaves grow at the tip of thin stems which naturally arch out from the base.

The leathery texture of the leaves and glossy surface are best maintained with monthly cleaning with a damp cloth. 

Flowering

Alocasia wentii flowering will happen rarely if at all when grown in a pot indoors. Blooming usually only occurs when the New Guinea Shield flower is grown outdoors in a subtropical climate.

If you live in growing zone 8 or higher, you may be able to plant your Alocasia wentii in the ground, where it can grow to a mature size and produce flowers.

However, the unremarkable white flowers are not as desirable as the foliage that is the main attraction. Some growers cut the flowers out to direct the plant’s energy to growing the leaves.

It’s best to not count on your Alocasia wentii flowering, but instead enjoy the magnificent foliage display.

Size and Growth

The size of Alocasia wentii depends on the age of the plant and where it is grown.

Alocasia wentii’s growth rate is slow. On average, it takes up to 10 years to reach its mature size of 3-5 feet when grown indoors in a pot. Unless pruned for width, its spread will be about the same.

If planted outdoors in the ground in a suitable climate (zones 8a and above), an Alocasia wentii plant can reach almost 10 feet tall. 

Alocasia wentii is an evergreen tropical plant, so while it will lose leaves as they grow, there will always be an attractive foliage show.

Alocasia wentii Fragrance

You are unlikely to ever notice any Alocasia wentii fragrance. The foliage has no smell.

While the flowers have a pleasant scent, flowering is rare for potted specimens grown indoors. 

The lack of fragrance makes Alocasia wentii a suitable plant for use in environments where fragrance is not desirable. These include medical offices or nursing homes where people may have sensitivities to scents. 

At the same time, Alocasia wentii does clean contaminants such as formaldehyde out of indoor air, so it can actually make the air smell better.

In your home garden, consider grouping Alocasia wentii with other plants that do have fragrance, such as many varieties of orchids.

Suggested Uses for Alocasia wentii

If you have the room for it, Alocasia wentii is a great addition to an indoors garden. 

The size of a mature plant may be a challenge to fit into a small apartment, but there are a couple of ways to deal with that.

As it grows in height, you can prune out lower leaves to create a tall but slender plant that arches out to form an umbrella shape towards the ceiling. 

Another alternative is to switch out a larger plant with the smaller divisions or offsets when you repot your Alocasia wentii. You could sell or give away the mother plant to someone with the space for it.

FAQ

What is Alocasia wentii? 

Alocasia wentii is a tropical plant native to Southeast Asia, and is also known as New Guinea Shield. It was first discovered in a Borneo rainforest.

How to identify Alocasia wentii? 

Alocasia wentii plants have large, shield-shaped leaves that reach up to 3 feet in length. The leaves are medium green on top with bronze-purple undersides.

How to care for Alocasia wentii? 

Alocasia wentii plants need warm temperatures and high humidity, as well as consistently moist but not sopping soil. It should receive bright, indirect light for optimum growth.

How to grow Alocasia wentii indoors? 

Alocasia wentii is usually grown indoors as a potted plant. Water weekly, fertilize monthly, and keep in a bright spot out of direct sun. Provide a humid microclimate. 

How to grow Alocasia wentii outdoors? 

Alocasia wentii can be grown outdoors year-round in growing zones 8 and above. Plant in well-draining garden soil in a shaded location. In colder zones potted plants can be moved out in summer.

How fast does Alocasia wentii grow? 

Alocasia wentii has a slow growth rate, taking up to 10 years to reach its mature size. It does not die back to the ground in winter but goes into dormancy.

How tall does Alocasia wentii grow? 

Alocasia wentii can reach 5 feet when grown as a potted plant, and 10 feet when grown outdoors in zones 8 and above. It has a spread of up to 5 feet.

How to make Alocasia wentii grow faster? 

For the fastest possible Alocasia wentii growth rate, provide it with its optimum temperature and humidity range, and fertilize it every few weeks in spring and summer.

How to stake Alocasia wentii? 

Alocasia wentii does not need to be staked. If it does seem to be leaning, turn the pot a quarter way once a week to ensure equal sun exposure.

How to pot Alocasia wentii? 

Alocasia wentii should be potted in loose, rich soil in a container with drainage holes. It does not mind a bit of crowding but do not let it become root-bound.

How to revive Alocasia wentii? 

If your Alocasia wentii soil becomes too dry, you need to fully water the soil to revive it. Plunge the pot into a bucket of water and let the soil get uniformly wet. 

Why is my Alocasia wentii dying? 

Your Alocasia wentii may have a fungal disease as a result of too-wet soil. Once you’ve diagnosed the problem, cut out all affected parts and repot in fresh soil.

Why is my Alocasia wentii drooping? 

Your Alocasia wentii may have too much or too little soil moisture. Either water more frequently or cut back on watering to avoid saturating the soil.

How cold can Alocasia wentii tolerate? 

Alocasia wentii is more hardy than other elephant ears. It can tolerate temperatures slightly below freezing, but should not be grown outside except in zones 8 and above. 

How to get rid of pests on Alocasia wentii? 

Alocasia wentii pests can usually be eliminated by using insecticidal soap or pyrethrin spray. Monthly use of neem oil when wiping down the leaves will discourage bugs. 

Is Alocasia wentii toxic to cats? 

Yes, Alocasia wentii is toxic to cats. Take your cat to the veterinarian if they are drooling, vomiting, or wheezing. Keep plants out of their reach.

Is Alocasia wentii toxic to dogs? 

Yes, Alocasia wentii is toxic to dogs. If your dog starts vomiting or wheezing and you suspect they have ingested it, take them to the veterinarian immediately.

Is Alocasia wentii toxic to children? 

Yes, Alocasia wentii is toxic to children. If your child has difficulty breathing or a swollen tongue, take them to the emergency room for medical care.

Is Alocasia wentii toxic to humans? 

Yes, Alocasia wentii is toxic to humans. The sap can cause a rash. Wear gloves while working with the plant, and rinse off any that gets on your skin.

Does Alocasia wentii have a scent? 

Alocasia wentii flowers do have a pleasant scent, but when plants are grown indoors in pots they rarely if ever flower. The foliage has no fragrance. 

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