Aglaonema Siam Aurora (Red Aglaonema): Care and Growing Guide

Aglaonema Siam Aurora (Red Aglaonema) Care

‘Siam Aurora’ is a beautiful type of red Aglaonema – tropical evergreen perennial with stunning exotic red and green pointed leaves. Red Aglaonema houseplants such as the ‘Siam Aurora’ cultivar add color and tropical accents to any interior décor. The many shades of red and sometimes dark pink can brighten up a room. What’s more, the red Siam Aglaonema plant is also easy to care for indoors.

‘Siam Aurora’ isn’t the only type of red Aglaonema. There are many other Aglaonema varieties with beautiful red or pink leaves. Other spectacular red Aglaonema plants include cultivars such as the ‘Super Red Star,’ ‘Red Anjamani’,’ ‘Red Emerald,’ ‘Georgi’s Ruby,’ and ‘Red Gold.’

This article is a complete care guide for the red Aglaonema ‘Siam Aurora.’ In addition to helpful growing tips, you’ll find solutions to resolving many issues with growing this colorful leafy houseplant.

How to Care for Red Aglaonema

To care for the aglaonema ‘Siam Aurora,’ grow the red Aglaonema in medium to high indirect sunlight. Plant the Aglaonema in loose, well-draining soil and water the plant only when the soil partially dries. ‘Siam Aurora’ prefers high humidity and a temperature range of 65°F to 76°F (18°C – 24°C).

Aglaonema ‘Siam Aurora’ Facts

Aglaonema 'Siam Aurora'

‘Siam Aurora’ cultivar is a type of red Aglaonema that grows in warm humid conditions

The red ‘Siam Aurora’ is a cultivar of the flowering tropical plant in the genus Aglaonema. Aglaonema plants are an evergreen plant species native to the tropical and subtropical forests of Asia. In their native habitat, Aglaonema species grow in warm, humid, shady conditions.

Aglaonema ‘Siam Aurora’ grows as a beautiful indoor plant with a medium growth rate. Growing in pots indoors, the colorful leafy foliage grows a maximum of 3 ft. (1 m) tall and 3 ft. (1 m) wide. Outdoors, this red Aglaonema grows in tropical climates such as USDA zones 10 and 11.

The attractive feature of red Aglaonema plants like the ‘Siam Aurora’ is its red and green, lance-shaped leaves. The large pointed green leaves have warm, rich variegated red colors. Most ‘Siam Aurora’ plants have bright red midribs with red edges. However, some eye-catching red ‘Siam Aurora’ plants have waxy pink or red leaves with green patches.

‘Siam Aurora’ Aglaonema Flowers

Aglaonema species like the ‘Siam Aurora’ are flowering exotic plants. ‘Siam Aurora’ flowers are spathe-like, consisting of a whitish-green spadix and light green spathe—a type of modified leaf. Flowers on red Aglaonema plants look like calla lilies or Anthurium plants.

Red ‘Siam Aurora’ Aglaonema plants bloom in late summer until early fall. The small spathe flowers are relatively insignificant compared to the magnificent red and green leaves. However, it’s uncommon for red aglaonema houseplants to bloom indoors.

Red Aglaonema ‘Siam Aurora’ Leaves

‘Siam Aurora’ leaves are large, lanceolate, or ovate red and green leaves. The waxy, green leaves are beautifully flushed with reddish-pink or dark red patterns. The red leaf variegation is most prominent on the midribs and margins. However, some ‘Siam Aurora’ plants have leaves that are almost entirely red.

Pink or Red Aglaonema

Many red Aglaonema varieties have leaf coloring with pink or red hues with green variegation. You’ll also find some ‘Siam Aurora’ Aglaonema plants with pink margins, pink veining, and bright pink stems. Sometimes, light levels can cause red Aglaonema plants to have dark pink and green leaves. Or, it could be variations in the Aglaonema cultivar.

Further reading: Red Aglaonema: Chinese Evergreen Plants with Red or Pink Leaves.

Aglaonema ‘Siam Aurora’ Care Guide

Let’s look in more detail at how to grow the red Aglaonema ‘Siam Aurora’ as a stunning houseplant.

Where to Grow Aglaonema ‘Siam Aurora’

The best place to grow a red Aglaonema plant is in a bright location. If you put the Aglaonema pot on a sunny windowsill, it’s vital to protect it from direct sunlight. However, the ‘Siam Aurora’ will keep its red and green variegated leaves even if you put the plant in a shaded room.

Because it loves humidity and doesn’t mind low lighting, a red Aglaonema is also a suitable plant for your bathroom. If you notice that the plant starts to wilt, you should move it to a brighter place.

Light Requirements for Growing Red Aglaonema

Aglaonema 'Siam Aurora' leaves

Red Aglaonema ‘Siam Aurora’ prefers high indirect sunlight to maintain it’s colorful foliage

Red ‘Siam Aurora’ Aglaonema grows best when it gets plenty of indirect sunlight. Bright light helps keep the vibrant red and green colors on the leaves. Red Aglaonemas are also plants that tolerate low light; however, you may notice that you lose some of the bright red leaf markings.

In winter, you may have to move the red Aglaonema to a brighter location. The cooler temperatures and darker days can cause the plant’s growth to slow down. It’s also best to water the plant less frequently in winter.

The Best Soil for Potted Aglaonema ‘Siam Aurora’ (Red Aglaonema)

A ‘Siam Aurora’ red Aglaonema thrives in a porous potting mix that has excellent drainage. To make an appropriate houseplant soil mix, combine one-part houseplant soil, one-part peat moss, and one-part perlite. You could also add some orchid bark to increase the drainage and organic matter.

The ideal soil for red Aglaonema plants should retain enough moisture without becoming waterlogged. A combination of peat moss and perlite is perfect for creating a light, aerated growing medium. It prevents the roots from becoming soggy and starting to rot—which would eventually kill your plant.

How to Water ‘Siam Aurora’ 

Water a red Aglaonema as often at the top 2” or 3” (5 – 7.5 cm) of the potting soil becomes dry. The best way to water ‘Siam Aurora’ plants is using the drench and dry method. This technique to water houseplants involves allowing the soil to dry, then drenching it. Caring for your red Aglaonema this way ensures the roots stay partially moist without becoming waterlogged.

The red ‘Siam Aurora’ plant is tolerant of drought and doesn’t require frequent watering. In summer, you’ll need to water the plant every week or two. In winter, you can water Chinese evergreens less often—maybe every three weeks or less.

As a rule, always allow soil moisture levels to guide you when to water a red Aglaonema. This way, you avoid overwatering the plant, which can happen when you water plants on a schedule.

Temperature Range for Colorful Aglaonema Houseplants

Red Aglaonema indoor plants thrive in temperatures between 65°F and 76°F (18°C – 24°C). However, being a tropical plant, a red Aglaonema will survive temperatures up to 85°F (29°C). The most crucial temperature requirement is to avoid the plant growing in cold drafts or hot airflow.

You can grow a red ‘Siam Aurora’ outdoors if the temperature is warm enough. Aglaonema plants are suitable for USDA zones 10 and 11.

In temperate climates, you can put your potted plants outside during the summer. Place the Aglaonema pot in dappled sunlight on your balcony, deck area, or patio. When temperatures dip below 65° (18°C), take the plant back indoors.

Humidity Requirements for Red Aglaonema

Aglaonema ‘Siam Aurora’ prefers humid conditions—like its native habitat in warm rainforests. However, these adaptable plants adjust to household humidity levels relatively well. You can occasionally mist a red Aglaonema to boost humidity. Additionally, you can place the pot on a pebble tray with water to increase air moisture.

To prevent humidity problems, avoid placing the plant near air conditioning vents or in a cold draft. Also, keep the ‘Siam Aurora’ away from heating ducts. A red Aglaonema can dry out rapidly when growing in hot or cold drafts. A lack of humidity is a reason for tipping—crispy brown patches that appear on leaf tips.

Red Aglaonema (‘Siam Aurora’) Growth Rate

The red ‘Siam Aurora’ has a medium growth rate. These red houseplants grow to between 2 and 3 ft. (0.6 – 1 m) tall and have compact, bushy foliage. In low light, you’ll notice that growth slows down, and the plant may lose some of its vibrant green and red leaf colors.

Fertilizer for Healthy Colored Aglaonema 

The red Aglaonema benefits from a diluted balanced houseplant fertilizer once a month during the warmer months in spring and summer. In fall, you may only have to fertilize the plant once. Then during winter, you should hold off from any fertilization.

With the ‘Siam Aurora,’ it’s vital to avoid over-fertilizing the plant. A buildup of mineral salts can cause root burn and turn the leaves brown or yellow. If you decide to apply fertilizer to your red leafy houseplant, always flush the potting soil every two or three months.

How to Prune Aglaonema ‘Siam Aurora’

Red Aglaonema plants rarely need pruning. The primary reason to snip leaves off a ‘Siam Aurora’ is to remove dead leaves or flowers. You can also prune new growth to encourage denser foliage and a bushier plant. Some plant owners also recommend pruning the flowers as soon as they appear.

To prune a red ‘Siam Aurora,’ cut the dead leaf at the stem’s base near the soil. You can also snip off new growth this way if you want a bushier red Aglaonema.

How to Propagate Red Aglaonema

You can propagate a ‘Siam Aurora’ by stem cuttings, seeds, or root division. The easiest method is to propagate red Aglaonema plants by dividing the root ball into two or three sections. This way, you can easily grow or gift a new beautiful red Aglaonema ‘Siam Aurora.’

To propagate a red Aglaonema, all you need to do is remove the root ball carefully from the pot. Look for parts that have at least two or three leaves growing. Using sharp, sterile equipment, cut the root into sections. Then, you can replant the propagated parts in a new pot.

Top Aglaonema care tip: Aglaonema ‘Siam Aurora’ contains irritant sap, so always wear protective gloves when handling the plant.

Repotting Aglaonema ‘Siam Aurora’ Plants

Repot a red Aglaonema every two or three years in springtime. Repotting Aglaonema plants in a larger pot gives the roots more room to grow. You also get the chance to refresh the potting soil and check the roots for signs of decay.

Here are some tips when repotting a red ‘Siam Aurora’:

  • Always use a fresh, light, well-draining potting mix.
  • Choose a pot one or two sizes larger than the current one.
  • Replant the red Aglaonema at the same height as it was growing before.
  • Check roots for signs of decay and remove as necessary.
  • Spring is the best time for repotting Aglaonema ‘Siam Aurora.’

Are Aglaonema ‘Siam Aurora’ Plants Toxic?

Yes, the red ‘Siam Aurora’ contains toxins that can be harmful to animals and humans.

According to the ASPCA, Chinese evergreen (Aglaonema) plants contain insoluble calcium oxalates. These toxins are harmful to cats and dogs. Ingesting them can cause oral irritation, swelling, and difficulty swallowing.

Researchers at the University of California say that plants in the Aglaonema genus are also harmful to humans. The oxalates in Chinese evergreens can cause skin irritation and rashes. Ingesting parts of the plant’s leaves or stems can result in oral swelling, breathing difficulties, and stomach upset.

Pests Affecting Red Aglaonema Growth

Common houseplant pests that can affect the ‘Siam Aurora’ include spider mites, mealybugs, aphids, and scale insects. Get rid of houseplant pests by spraying the red and green foliage with a neem oil solution. Mix 2 tsp. neem oil and 1 tsp. dish soap, with a quart (1 l) of warm water. Spray the Aglaonema leaves liberally once a week to get rid of plant bugs.

To prevent pest infestations from killing your red Aglaonema, it’s crucial to spot the signs of bugs and mites. Here are some signs of houseplant pests to look out for:

  • Mealybugs—These are small white creatures on the underside of foliage that leave a cottony-wool-like substance behind.
  • Spider mites—Look for thin strands of spider webs on foliage or webbing on stems.
  • Scale insects—Scale looks like bumpy growth on Aglaonema stems. Use rubbing alcohol to remove scales on contact.
  • Aphids—Aphids are tiny green or black insects that lurk under leaves and suck the sap from plants.

Related reading: How to use neem oil on houseplants.

Diseases Affecting Red Siam Aglaonema Growth

Red ‘Siam Aurora’ is susceptible to fungal infections due to root rot. Overwatering can cause brown leaf spots to appear that ruin the beautiful red and green foliage. Also, too much fertilizer can result in large gray-brown blotches on leaf tips, margins, or the underside.

The best way to prevent disease in red Aglaonema plants is to water only when necessary and never over-fertilize a plant.

To resolve root rot, you may have to repot the plant and remove all decayed parts of the root. Then you should replant the Aglaonema ‘Siam Aurora’ in a fresh potting mix. Unfortunately, if rot is extensive, you may have to cut your losses and get a new plant.

FAQs About Red Aglaonema ‘Siam Aurora’ Care

Aglaonema ‘Siam Aurora’ is relatively easy to care for. If you water the tropical plant properly and keep it out of direct sunlight, you shouldn’t have any problems. However, there are some signs that your red leafy plant could be under stress.

Why are my red Aglaonema leaves turning brown?

Tipping is common with Aglaonema plants, where the ends of the leaves turn brown. Brown tips on the pointed leaves are often caused by mineral salts and chemicals in tap water. Also, a lack of humidity, overwatering, or a buildup of fertilizer in the soil can cause Aglaonema leaves to turn brown.

Why is my Aglaonema ‘Siam Aurora’ drooping?

Wilting foliage on a red Aglaonema is usually a sign of low lighting or overwatering. Although red Aglaonema plants can survive low light, the foliage color and growth suffer when it’s too dark. Additionally, excess moisture in the soil can cause leaves to droop and turn yellow.

Why are ‘Siam Aurora’ Aglaonema leaves turning yellow?

Aglaonema ‘Siam Aurora’ houseplants can lose their red and green leaf colors and turn yellow due to too much water. Aglaonema plants get stressed when there’s too much dampness in the soil. Also, watering infrequently can stress plants and cause them to develop yellow leaves.

How can I make my red Aglaonema bushy?

Pruning new growth is the best way to grow a bushy red ‘Siam Aurora’ aglaonema. You can also prune stems that have become leggy due to growing in insufficient light or small pots.

Why is my red Siam Aglaonema dying?

The most common reason red Aglaonema plants start to die is overwatering. Only water these tropical plants when the top part of the soil is dry. This houseplant watering technique prevents the roots from rotting or the stems from becoming saturated.

To help revive a dying ‘Siam Aurora,’ replant it in fresh potting soil and only water it when necessary.

Is red Aglaonema a lucky plant? 

Some people consider Aglaonema plants (Chinese evergreens) as auspicious plants that bring good luck. In Feng Shui, Aglaonema is said to be a harbinger of good fortune and is sometimes referred to as the ‘Lucky Plant.’

Do red Aglaonema houseplants purify the air?

Some scientific research suggests that varieties of Aglaonema help clean household air. One study found that certain species of Chinese evergreens help remove harmful chemicals from the air. For example, Aglaonema houseplants helped reduce airborne toxins such as xylene, benzene, toluene, and formaldehyde.

Discover the best air filtering houseplants.

Related articles: