Everything You Need to Know About How to Grow Stromanthe Triostar Indoors

With colorful leaves that resemble a watercolor painting, the Stromanthe triostar (Stromanthe sanguinea) is a striking addition to any home. Not only are these plants beautiful, but they also put on a show! As members of the prayer plant family (Marantaceae), their leaves move in response to the sun showcasing pink and green leaves. Before you add a triostar to your home, you should be aware these plants can be a bit finicky. However, they can thrive if you provide the proper care. In this guide, we’re going to take you through everything you need to know about how to grow and care for Stromanthe Triostar at home, including planting considerations, the best soil mix, watering cycles, light requirements, temperature preferences, when to fertilize, pest control, and more!


How to Grow Stromanthe Triostar – The Essentials

Botanical Name:Stromanthe sanguinea
Also Known As:Stromanthe triostar, magenta triostar, stromanthe tricolor
Growing Difficulty:Moderate, not recommended for beginners
Light Requirements:Bright, indirect light for at least six hours each day
Temp & Humidity:Requires high humidity and temperatures between 65-85ºF
Watering Needs:Aim to keep the soil moist but not saturated, water with distilled water or rainwater when the top inch of soil is dry
Soil Preferences:Well-draining with a pH between 6.0-7.5
Fertilizing:Fertilize with a balanced houseplant fertilizer once per month in the spring and summer
Growth Expectations:Up to three feet tall indoors
Toxicity:Non-toxic to humans and pets

About Stromanthe Triostar

About Stromanthe Triostar

The stromanthe triostar (Stromanthe sanguinea) is a member of the prayer plant family, Marantaceae. Therefore, it’s related to plants in the Calathea genus.

Stromanthe sanguinea is native to tropical forests of Brazil and other nearby countries.

People first used these plants as landscaping plants in warm areas. At one point, these plants were named Florida Plant of the Year. Eventually, people began growing triostars as houseplants.

No matter where you grow these plants, you’ll enjoy their beauty. As the name triostar suggests, these plants display three colors: white, pink, and green.

The plant produces thick, elongated, ovular leaves atop short pink petioles. The tops of the leaves are white and dark green with some light pink, with dark pink or burgundy undersides. Each leaf exhibits different color variations, leading to quite the stunning display!

Like prayer-plants, the triostar moves its leaves in response to light. The leaves fold up at night and then orient to the sun in the morning.

Due to its beautiful form, Stromanthe sanguinea is primarily used as an ornamental plant. With the proper care, these plants can live over 15 years indoors.

As another bonus, these plants are non-toxic to humans as well as cats and dogs.


How to Grow Stromanthe Triostar 

How to Grow Stromanthe Triostar 

Growth Expectations

While stromanthe triostar can grow up to five feet tall outdoors, these plants will remain a bit smaller indoors. You can expect your plant to grow up to three feet tall in the ideal indoor environment.

What to Do Before Planting

Since these plants grow upright, you’ll need to find a space that can handle their growth. A side table or plant stand is a great option.

You will also need to select a container with drainage holes. Any material is fine, but be aware that terra cotta pots will cause soil to dry out more quickly.

What’s the Best Soil Mix?

The ideal potting mix will hold moisture yet allow excess water to escape.

If you’d like to make your own potting mix, you’ll need to combine water-holding materials like peat moss or coco coir with materials that increase drainage and aeration. The following combination will make a good soil mix.

  • four parts coco coir
  • two park pine bark fines
  • one part pumice
  • one park perlite

You can also purchase a pre-mixed potting soil. This soil mix is specifically designed for calatheas (relatives of stromanthe plants), and it has excellent reviews.

Alternatively, you can purchase a soil mix like Fox Farm Ocean Forest or Miracle-Gro Houseplant Potting Mix. If you go with one of these options, mix in a few extra cups of pine bark or perlite to improve drainage.

How to Plant 

How to Plant

Planting your stromanthe triostar is easy.

First, select a container with drainage holes. The planter should be just a few inches larger than your plant’s root ball.

Line the bottom of the container with an inch of potting soil then place your plant’s root ball. Fill in the remaining space with more potting soil then water well.

Light Preferences

These plants like plenty of bright, indirect light. Aim to provide them with at least six hours of light per day. They will not grow well in dark areas and will become damaged by direct sunlight.

A room with south-facing windows typically receives the best light exposure. Make sure to place your plant a few feet away from the window so it’s not receiving direct light.

If you don’t have a room with south-facing windows, look for a bright spot near a west-facing window.

Temperature & Humidity Preferences

Since these plants come from tropical rainforests in Brazil, they like warm and humid air.

Keep the air temperature between 65-85ºF and avoid exposing your plant to both hot and cold drafts. You should also avoid sudden changes in temperature since triostars are sensitive plants.

When it comes to humidity, you can’t have too much of it. Triostars thrive in humidity at or near to 100%. If the humidity is constantly below 60%, your plant will suffer.

Comparatively, the ideal humidity for your home and your health is between 30-60%. That means providing enough humidity is one of the most challenging parts of properly caring for these beautiful plants.

Fortunately, you can alter your home’s humidity. A humidifier is the easiest way to keep air moisture high in the area of your home where you keep your plant.

Alternatively, you can mist your plant a few times a day. Another option is to place a tray filled with pebbles and water underneath your plant’s pot. Just make sure the container isn’t sitting in the water.


How to Care for Stromanthe Triostar at Home

How to Care for Stromanthe Triostar at Home

Watering

Stromanthe triostar plants like their soil consistently moist but not saturated. Aim to water when the top inch of soil is dry, about once every one to two weeks.

Of course, the frequency you water depends on numerous environmental conditions. You will need to water more often in the summer than you will in the winter. Additionally, you’ll want to water more often if your plant is in a bright location and your home’s humidity is low.

When you water, it’s best to avoid tap water. Like all members of the Stromanthe genus, these plants are a bit sensitive to minerals in the water.

Rainwater and distilled water will provide your plants with the moisture they need without causing any harm.

Fertilizing

Regular fertilization will provide your stromanthe triostar with the nutrients it needs. Select a balanced houseplant fertilizer, and dilute according to product instructions.

Fertilize once per month during the spring and summer.

Pruning

Pruning

Stromanthe sanguinea doesn’t require heavy pruning. However, pruning will help it maintain a healthy shape and form.

If you see discolored or diseased leaves, you should remove them. You can do this any time of the year.

Use a sharp and sanitized knife or pair of scissors to cut the leaf at the end of the petiole. 

Propagating

The easiest way to propagate these plants is by division. When you notice your plant has multiple clumps of stems and leaves, it’s ready to divide.

Remove your plant from its container and gently separate the clumps. You may need to use a knife to separate the roots.

After you’ve separated the leaf clumps, place each one in a pot filled with well-draining potting soil then water well.

Repotting

Depending on your plant’s growth rate, you’ll need to repot it every two to three years. If you see roots growing out of the bottom of the container, it’s definitely time to repot. The spring or early summer is the best time for repotting.

To repot, follow these steps.

  1. Choose a container that is only one to two inches larger than the original.
  2. Fill the new container with an inch of well-draining potting soil.
  3. Remove your plant from the original container and inspect roots for rot.
  4. Use a sharp pair of shears to trim off any rotten or discolored roots.
  5. Place the plant in the new container.
  6. Use more potting soil to fill in the empty space.
  7. Water well.

Common Stromanthe Triostar Problems & How to Treat Them

Common Stromanthe Triostar Problems & How to Treat Them

Dry Leaf Edges

If you notice brown and crispy leaf edges, low humidity is likely to blame. As we mentioned before, these plants LOVE humidity.

To boost the humidity in your home, invest in a humidifier. Not only will this help your triostar, but it will also benefit other humidity-loving houseplants.

While increasing the humidity won’t repair leaves that are already damaged, it will prevent future damage.

Curling Leaves

While it’s natural for this plant’s leaves to move with the day, they shouldn’t curl. Curling leaves can indicate numerous environmental problems.

One possible cause is dry soil. Remember to water your plant when only the top inch of soil is dry. If you notice the soil is dry, a good soak can fix the curling leaves.

Another possible cause is low humidity. Use a humidifier to increase moisture or regularly mist your plant with a spray bottle.

Yellowing Leaves

When your plant’s leaves begin to turn yellow, it’s a sign something is awry.

Overwatering is the most common cause of yellow leaves. Try watering your plant a bit less and see if the problem improves. However, be aware it may take a few weeks or months to see any noticeable improvement.

Another possible cause is poorly draining potting soil. Make sure you are using well-aerated soil and allow excess water to escape.

If the soil still seems moist a few weeks after watering, you should repot your plant using a well-draining soil mix.

One more possible cause is insufficient light. While these plants don’t like direct light, they will suffer in dark places.

Sap-Sucking Pests

Stromanthe triostar is susceptible to damage from sap-sucking pests, including aphids, spider mites, thrips, and mealybugs. These pests can cause stippling and spread disease.

If you spot any of these tiny pests, remove them immediately. You can typically wipe pests off with a soapy rag. However, consider spraying the pests with insecticidal soap or horticultural oil if you’re dealing with a large infestation.


Essential Tools

Essential Tools

Since stromanthe triostar likes a humid environment, you’ll need to have a way to boost the humidity in your home.

A humidifier is an easy way to increase the humidity and keep it at a stable level. This inexpensive humidifier runs quietly and comes with an automatic shutoff. You can control the humidity level, so your triostar stays happy.


Growing Stromanthe Triostar FAQs:

Is Stromanthe Triostar a Good Indoor Plant?

Yes, the stromanthe triostar can thrive indoors. The keys to keeping an indoor plant happy are high humidity, lots of indirect light, warm temperatures, and moist soil.

How Big Does a Stromanthe Triostar Get?

When grown indoors, this plant will grow up to three feet tall. However, plants often max out at two feet tall.

How Fast Do Stromanthe Triostar Grow?

These plants grow at a moderate rate. They can produce multiple new leaves per year and grow up to a foot per year.

Is Stromanthe Triostar a Rare Plant?

While these plants were once difficult to find, this has changed. You can now find these plants via garden centers and online retailers.

Is Stromanthe Triostar Poisonous to Dogs and Other Pets?

No, this plant is non-toxic to dogs, cats, and other pets. With that said, you shouldn’t allow your pets to ingest the plant.

Can a Stromanthe Triostar Tolerate Low Light?

While these plants can tolerate low light for a few years, they won’t thrive. To keep them healthy, place them in a location that receives bright, indirect light.


Wrapping Up

Now that you know how to care for these tropical beauties, go ahead and add one to your home. Remember to provide your plant with high humidity, moist soil, and lots of bright, indirect light.


Briana Yablonski
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Briana holds a B.S. in Plant Sciences from Penn State University. She manages a small market garden where she grows vegetables and herbs. She also enjoys growing flowers and houseplants at home.

Author

Briana holds a B.S. in Plant Sciences from Penn State University. She manages a small market garden where she grows vegetables and herbs. She also enjoys growing flowers and houseplants at home.

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