Rex Begonia Care Indoors: Complete Care Guide

Rex Begonia Care Indoors focuses on maintaining the colorful foliage that makes these plants so popular. With their striking patterns, metallic colors, and unique leaf shapes, Rex Begonias can become standout additions to desks, shelves, and plant displays.

While they look exotic, Rex Begonias are relatively straightforward to grow when provided with bright indirect light, consistent moisture, moderate humidity, and a well-draining growing medium.

This guide covers everything you need to know about Rex Begonia Care Indoors, including lighting, watering, soil, humidity, propagation, repotting, and troubleshooting common problems.

What Is Rex Begonia?

Red Robin, Begonia Rex, Dark 4 inch Painted-Leaf Begonia, Variegated

Rex begonia is one of the most interesting indoor plants around, and despite its exotic looks they are actually very easy to grow.

It’s the perfect size for desks and tabletops because it stays fairly short and has wildly colorful variegated foliage which makes a great contrast against other houseplants!

Begonia rex is native to parts of Asia and has been used to develop hundreds of colorful cultivars that are now popular as houseplants worldwide.

How To Care For Rex Begonias Indoors In A Nutshell

How To Care For Rex Begonias Indoors a quick summary:

• Rex begonias need moderate to bright indirect light.
• Rex begonias like to be kept moist, but not soggy. 
• Rex begonias do well at 60 to 70 degrees Fahrenheit
• They also like about 50% humidity level.
• Rex begonias are not heavy feeders, so fertilize them every other month or so.
•  Rex begonias are susceptible to mealybugs, so keep an eye out for these pests.

Rex Begonia Care Indoors

Rex Begonia Variety Pack

So you have a Rex begonia and you want to know how to take care of it. Fortunately, these beautiful plants are easy to grow and easy to propagate.

Below you will find more detailed information on how to care for your Rex begonia.

Rex Begonia Light Requirements

One of the most important things to consider when growing Rex Begonias is their light requirements.

These plants prefer bright, indirect light and will not do well if they are placed in an area that receives direct sunlight.

Signs of too much sunlight can be bleaching leaves and fading from green to yellow. Leaves may also look scorched.

If you see this move your plant to a lower light area.

Best Indoor Locations for Rex Begonias

Proper placement can make a significant difference in leaf color, growth rate, and overall plant health.

• East-Facing Windows: Gentle morning sun and bright indirect light are ideal.
• Bright Rooms Near Windows: Excellent for maintaining strong foliage color.
• Plant Shelves With Supplemental Lighting: Useful in darker homes.
• Desks and Tabletops Near Bright Windows: A popular location because of their compact size.

Avoid direct afternoon sunlight, which can fade colors and damage delicate foliage.

Rex Begonia Temperature And Humidity

Most Rex Begonia varieties prefer warm temperatures and high humidity. A humidity level of 50% will keep them happy.

If the air in your home is dry, you may need to mist your Rex Begonia regularly or set it on a pebble tray to keep the leaves from drying out.

If leaf edges are curling or turning brown your plant is not getting enough humidity.

When it comes to temperature, Rex Begonias will do best if kept between 65 and 75 degrees Fahrenheit.

Begonia Rex Watering

Watering your Begonia Rex is important, but it’s also equally as important not to overwater it.

The best way to water this type of Begonia is to give it a good soaking, then allow the soil to dry out completely before watering again.

This will help to prevent root rot, which can be a problem with begonias.

When you do water, make sure to use lukewarm water and avoid getting the leaves wet.

Watering in the morning is best, as this will give the plant time to dry out before nighttime.

Pot Size Affects Watering

Keep in mind a rex begonia that is planted in a pot that is too small will not have room to develop an extensive root system and will be more prone to drought stress and need more frequent watering.

On the other hand, they like to be snug in their pots and shouldn’t be over-potted either as the soil may take too long to dry out.

Begonia Rex Soil Mix

Rex begonias do best in a soil mix that is high in organic matter and drains well. 

Coco makes an excellent growing medium for rex begonias because it holds moisture well but is also fast draining.

A coco coir and perlite mix is one of the best growing media for Rex Begonias because it holds moisture while still providing excellent drainage and root-zone aeration.

Regardless of the growing medium you choose, always use containers with drainage holes to prevent excess moisture from accumulating around the roots.

Fertilizing Rex Begonias

Rex Begonias are not heavy feeders, but occasional fertilizing can support healthy foliage growth and vibrant coloration.

Apply a balanced liquid fertilizer diluted to half strength every four to six weeks during spring and summer. Reduce feeding during fall and winter when growth naturally slows.

Pruning Rex Begonia

Rex begonias are a great plant for beginners because they only require minimal pruning.

Removing any dying or discolored leaves is usually all that is needed. But you can trim back any long or unruly stems to help shape the plant.

If you want to create fuller plants, cut back stems to a node with clean snips and watch as new leaves grow in from the base.

You can also pinch young tips so that the plant gets bushier.

Repotting Rex Begonias

Rex Begonias generally prefer to remain slightly snug in their containers and do not require frequent repotting.

Repot every one to two years or when roots begin circling heavily inside the container. Move to a pot only one size larger and use a fresh coco coir-based growing mix with added perlite for drainage.

Always choose containers with drainage holes to reduce the risk of root rot.

Rex Begonia Propagation

Rex begonias are very easy to propagate, They can be propagated by leaf cuttings but they can also be propagated and even grown in water culture.

Propagating Rex Begonia From Leaf Cuttings

Here is a video showing you how to propagate Rex begonias from leaf cuttings.

Propagating Rex Begonia In Water

Rex begonias also can be propagated and grown in water culture. One advantage of this is avoiding soil and pests like fungus gnats that can come with using soil.

Is Rex Begonia Poisonous?

According to the ASPCA Rex begonia is toxic to cats, dogs, and humans with the roots being the most toxic.

Family: Begoniaceae

Toxicity: Toxic to Dogs, Toxic to Cats, Toxic to Horses

Toxic Principles: Soluble calcium oxalates

Some people say the leaves are not toxic but personally, I would not take the chance of kids or pets getting poisoned. I would keep this plant in a place where children and pets can not access it.

Common Rex Begonia Problems

Brown Leaf Edges

Brown edges are often caused by low humidity, inconsistent watering, or excessive fertilizer.

Faded Leaf Color

Insufficient light can reduce the vibrant colors that make Rex Begonias so attractive.

Drooping Leaves

Drooping can result from both underwatering and overwatering. Check the growing medium before watering.

Powdery Mildew

Poor airflow and excessive moisture around foliage can encourage fungal issues.

Root Rot

Root rot is usually caused by overwatering or poorly draining growing media.

Rex Begonia Care Indoors FAQs

How much light does a Rex Begonia need?

Rex Begonias grow best in bright indirect light. Direct afternoon sun can scorch the leaves.

How often should I water a Rex Begonia?

Water thoroughly when the growing medium has partially dried. Avoid constantly wet soil.

What is the best soil for Rex Begonias?

A coco coir-based mix with added perlite provides excellent moisture retention while maintaining good drainage.

Why are my Rex Begonia leaves turning brown?

Brown edges are often caused by low humidity, inconsistent watering, or fertilizer buildup.

Are Rex Begonias toxic to pets?

Yes. Rex Begonias are considered toxic to cats and dogs if ingested.

Why are my Rex Begonia leaves losing their color?

Insufficient light is one of the most common reasons Rex Begonias lose their vibrant coloration. Move the plant to a brighter location with bright indirect light.

Rex Begonia Care Indoors Final Thoughts

Rex Begonias are grown primarily for their extraordinary foliage, making them some of the most visually striking houseplants available. Their unique colors, patterns, and textures allow them to stand out in almost any indoor plant collection.

Providing bright indirect light, moderate humidity, careful watering, and a well-draining coco coir-based growing medium will help keep your plants healthy and colorful.

With proper Rex Begonia Care Indoors, these beautiful foliage plants can provide year-round color and interest throughout your home.