Red box (Eucalyptus polyanthemos)

Also known as: Redbox gum

The Red Box (Eucalyptus polyanthemos) is an evergreen tree native to southeastern Australia, typically growing between 10 and 25 meters in height. It features round to lance-shaped, grey-green leaves, with juvenile leaves being more rounded and blue-green. The tree's trunk and branches are covered with rough, fibrous bark.

### Key Characteristics:
- **Height**: Reaches 10-25 meters.
- **Leaves**: Juvenile leaves are round and blue-green; adult leaves are lance-shaped and grey-green.
- **Bark**: Rough and fibrous.
- **Flowers**: Small white to cream-colored clusters, blooming in late winter to spring.
- **Fragrance**: The foliage is aromatic.

### Growing Conditions:
- **Soil**: Prefers well-drained soils, adaptable to clay, loam, and other soil types.
- **Light**: Best in full sun but can tolerate partial shade.
- **Water**: Drought-tolerant once established; occasional watering is beneficial during long dry spells.
- **Climate**: Suitable for temperate climates; endures light frost.
- **Propagation**: Commonly grown from seeds.

This tree is often used in landscaping and reforestation due to its attractive appearance and adaptability.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting Toxicity

Attributes of Red box

Lifespan

Perennial

Plant Type

Tree

Plant Height

20 m to 25 m

Spread

4.5 m to 14 m

Leaf Color

Green Gray Silver

Flower Size

2.5 cm

Flower Color

White

Images of Red box

Quickly Identify Red box

Imposing size: 40-60 feet (12-18 meters) tall and 30-45 feet (9-14 meters) wide.

Grayish-green, oval-shaped leaves hanging from white branches on elongated petioles.

Clusters of inconspicuous cream flowers during spring and summer.

Resilient to cold, surviving down to 14°F (-10°C).

Slender form with a crown of oval leaves, adding vertical interest to landscapes.

Scientific Classification of Red box

Phylum

Vascular plants

Class

Dicotyledons

Order

Myrtales

Family

Myrtle

Genus

Eucalypts

Species

Red box

Planting and Growing of Red box

Care Difficulty

Easy

Watering Schedule

Every 3 days

Sunlight Requirements

Full sun

Sunshine Duration

4-8 hours

Ideal Temperature

60-75℉

Soil Type

Potting Mix, Peat Mix

Soil pH

6-7.5

Fertilizer Type

Balanced

Pruning Season

Spring, Summer

Pruning Area

Branches, Leaves

Pruning Frequency

2 times a year

Repotting Season

Spring

Pot Type

Plastic, Ceramic

How to Water Red box?

Eucalyptus polyanthemos thrives with moderate watering. It's important that the soil is allowed to dry out between waterings but not to the extent that it becomes bone dry. Water until the water just starts to seep out of drainage holes, ensuring the entire root system is reached.

What are the symptoms of an underwatered Red box? ›

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What are the symptoms of an overwatered Red box? ›

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What Are the Sunlight Requirements for Red box?

Sunlight Requirements: Full sun, Partial sun

Duration of light: 6-8 hours daily

Eucalyptus polyanthemos thrives in full sun with at least 6-8 hours of sunlight. This range enables it to perform photosynthesis efficiently, supporting its growth and essential oil production. The plant becomes more resilient and lush with adequate light.

What is the best lighting environment for Eucalyptus polyanthemos? ›

How to achieve ideal lighting for Eucalyptus polyanthemos? ›

What are the benefits of ideal lighting for Eucalyptus polyanthemos? ›

More About Sunlight Requirements Techniques→

What Is the Ideal Temperature Range for Red box?

Ideal Temperature: 60 ~ 75℉

The ideal temperature for growing Eucalyptus polyanthemos is between 60°F and 75°F. This temperature range mimics the plant's natural Australian environment, promoting optimal growth and leaf development. Temperatures outside this range can stress the plant and affect its health.

What Soil is Best for Red box?

Soil type: Loam, Clay soil, Sandy loam

Soil PH: 6 ~ 7.5

Eucalyptus polyanthemos requires soil with good drainage to prevent root rot and other water-related issues. Well-draining soil ensures that water doesn't pool around the roots, promoting healthy growth and preventing diseases. Although not particularly demanding, this eucalyptus benefits from a nutrient-rich environment. A soil enriched with organic matter supports robust growth and enhances the tree’s ability to withstand environmental stress. The soil should retain enough moisture to sustain the plant between waterings, but without becoming waterlogged. Eucalyptus polyanthemos thrives in soil that balances moisture and air, aiding in healthy root development.

How to Fertilize Red box?

Fertilizer type: Balanced

For Eucalyptus polyanthemos, start with a balanced fertilizer. Use approximately 1 tablespoon of granular slow-release fertilizer per square foot of soil space. For liquid fertilizers, dilute according to package instructions, typically using a 1:10 ratio with water.

How to Prune Red box?

Pruning Time: Spring, Summer, Autumn

Start by identifying the branches that need removal. Focus on dead, diseased, or crossing branches that affect the plant's structure and health. Clear these, keeping the tree's natural shape. Make cuts at a 45-degree angle just outside the branch collar to ensure optimal healing. Avoid leaving stubs that can attract pests or diseases. Trim tops of branches to encourage bushier growth. This helps maintain a robust and fuller appearance, improving the ornamental value of the eucalyptus. More About Pruning Techniques→

How to Propagate Red box plant?

Propagate Time: Spring, Early summer

Collect seeds from mature Eucalyptus polyanthemos trees. Clean them thoroughly to remove any pulp, and soak them in water for a few hours to break any dormancy and facilitate germination.

Fill a seed tray with a well-draining soil mix. Plant the seeds just below the surface, water them lightly, and cover the tray with a plastic lid. Place it in a warm, sunny spot.

Cuttings should be taken during the early summer when the plant is actively growing. Select healthy branches and cut below a node. Remove lower leaves and immerse the cut end in a rooting hormone before planting in moist soil.

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How to Repot Red box plant?

Repotting frequency: Every 2-3 years

Look out for roots emerging from the drainage holes, wilting leaves, or the plant becoming root-bound as signs that it's time to repot Eucalyptus polyanthemos. These signals indicate the pot is too small, restricting root growth.

When selecting a pot for Eucalyptus polyanthemos, opt for one that is only slightly larger than the current one. A pot that is too big may lead to water retention issues. Ensure it has enough drainage holes to prevent root rot caused by waterlogging.

Choose a well-draining soil mix for Eucalyptus polyanthemos. The soil should provide stability while allowing water to easily pass through, preventing root rot. A mix with components like sand, perlite, and bark can improve aeration and drainage, benefiting overall root health.

Toxicity of Red box

Is Red box toxic to humans?

The Red box has a low level of toxicity to humans, mainly due to the accidental ingestion of its essential oil. The essential oil, identified as the toxic component of the plant, may result in poisoning if ingested. After consumption, individuals might face various symptoms, including gastrointestinal issues like nausea, vomiting, and diarrhea. Furthermore, central nervous system effects such as dizziness and confusion may also occur. It is crucial for people to recognize these potential hazards, particularly when interacting with the plant, to avoid unintended poisoning.

Is Red box toxic to cat?

The red box presents a mild toxic risk to felines. Cats may unintentionally consume portions of the plant that have essential oils, which can result in poisoning. Cats that are affected may show signs that suggest physical unease or illness. Should exposure occur alongside these symptoms, it is crucial to obtain immediate veterinary assistance to ensure the cat receives appropriate treatment.

Is Red box toxic to dog?

The plant species known as red box is recognized for its mild toxicity towards dogs. Dogs may suffer from poisoning due to accidental consumption of this plant. The toxic components of red box are its essential oils, which can result in a variety of symptoms that signify poisoning when ingested. Dog owners should remain alert for indicators such as vomiting, diarrhea, weakness, or any abnormal behavior that might imply their pet has consumed a portion of the plant. If a dog shows signs of poisoning following possible exposure to red box, it is essential for the owner to seek prompt veterinary attention to ensure the best possible outcome for their pet.

WARNING

The judgment on toxicity and danger is for reference only. We DO NOT GUARANTEE any accuracy of such judgment. Therefore, you SHALL NOT rely on such judgment. It is IMPORTANT TO SEEK PROFESSIONAL ADVICE in advance when necessary.

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