Intsia bijuga — an easy houseplant, prefers full sun light
SPECIMEN · FROM THE LIBRARY
Intsia bijuga

Intsia Bijuga

Updated · 31 observations
ON THIS PLANT

Intsia bijuga, commonly known as Borneo teak, Johnstone River teak, Kwila, Moluccan ironwood, Pacific teak, scrub mahogany and vesi, is a species of flowering tree in the family Fabaceae, native to the Indo-Pacific. It ranges from Tanzania and Madagascar east through India and Queensland, Australia, Papua New Guinea to the Pacific islands of Fiji and Samoa.It grows to around 50 metres (160 feet) tall with a highly buttressed trunk. It inhabits mangrove forests. Intsia bijuga differ from Intsia palembanica in the number of leaflets that make up their compound leaves.The tree has a variety of common names including ipil and kwila.

A note from PlantMom

Scrub mahogany shows strong resistance to disease and is generally not susceptible to illnesses. In terms of care, this plant is fairly low maintenance. When grown outdoors it needs only light watering, and larger plants typically do not require pruning. Smaller plants, however, should be pruned after they finish blooming. Scrub mahogany is appropriate for anyone who has an outdoor area, such as a garden or deck, and it does not demand extensive gardening experience.

— PlantMom
CARE GUIDE

How to keep Intsia Bijuga.

Light

Scrub mahogany comes from open habitats, such as sunny meadows and forest edges, where abundant light is present. It thrives in Full Sun but can also tolerate Partial Sun, demonstrating adaptability to a range of sunlight conditions.

Water

Scrub mahogany, a plant native to coastal areas, thrives in conditions of high humidity and can withstand periods of water scarcity. It needs moderate watering every 2-3 weeks. As an outdoor plant, it is adaptable to various climate zones and efficiently adjusts its water intake throughout different growth cycles.

Temperature

Scrub mahogany comes from tropical areas, where the weather is generally warm and humid. As a result, it is well suited to high temperatures and humidity. It does not tolerate sudden temperature changes and prefers a stable temperature environment, so it is important to avoid temperature fluctuations indoors. It usually cannot withstand cold temperatures and requires higher temperatures to grow. If the environmental temperature falls too low, the plant may stop growing or even die.

Fertilizer

Fertilization is essential to the care of Scrub mahogany. Regular feeding during the growing season preserves the energy needed for its showy leaves and supports overall growth. Neglecting fertilization can lead to unhealthy foliage, reduced ornamental appeal, and stunted or weak growth that is prone to breakage.

Pruning

Pruning scrub mahogany during early to late winter can enhance its strong hardwood properties and ornamental appeal. Begin by removing any dead or diseased branches and thinning the canopy to improve air circulation and light penetration. Regular pruning not only boosts the plant's vigor and resilience against pests but also helps maintain its overall health. Always ensure that your tools are sanitized to prevent the spread of disease.

CHARACTERISTICS

Botanical profile.

Plant Type
Tree
Life Cycle
Perennial
Genus
Intsia
Family
Fabaceae
Hardiness Zone
10-11
Mature Height
20.12 m to 29.87 m
Mature Spread
10.06 m to 14.94 m
Leaf Color
Dark Green
Leaf Type
Evergreen
Flower Color
Yellow, Orange
Flower Size
1.02 cm to 1.52 cm
Bloom Time
Summer
Planting Time
Spring, Summer, Autumn
Harvest Time
Late summer, Fall
Native Area
Sri Lanka, India, Malaysia, Vanuatu, Philippines, Madagascar, Bangladesh, Fiji, Brunei, Tanzania, Indonesia, Cambodia, Vietnam, Myanmar, Japan, Singapore, Thailand
ALSO KNOWN AS

Other names.

en Johnstone River-teak en Moluccan ironwood en Pacific-teak en Scrub-mahogany en Borneo-teak en Ifil en Bajam teak en Ipil en Fehi en Gayac
FREQUENTLY ASKED

Reader questions.

How should I water my Scrub mahogany properly?

To water your Scrub mahogany, you have various options such as watering cans, hoses, or cups. It's important to apply the water directly to the soil, making sure to moisten all areas evenly to provide sufficient water to the entire root system. Filtered water is preferable to tap water, as tap water may contain harmful particles. It's also recommended to use water that is at or slightly above room temperature to avoid shocking the plant. However, the Scrub mahogany usually responds well to any type of water it receives.

What are the sunlight requirements for Scrub Mahogany?

Scrub mahogany requires full sun, defined as more than 6 hours of sunlight daily, to thrive, but it can also tolerate partial sun, receiving about 3-6 hours of sunlight. Originating from open environments like sunny meadows and forest edges, it is well adapted to various sunlight conditions. When monitoring your garden, aim for spots that provide an ideal balance of light and shade, ensuring the plants' optimal growth.

What should I do if I give my Scrub mahogany plant too much or too little water?

For outdoor plants, especially newly planted ones or seedlings, it is common for them to not receive enough water. It is important to remember to water them adequately for the first few months, particularly when the tree is small or recently planted. Once the roots are established, Scrub mahogany trees can typically rely on rainfall. When Scrub mahogany trees are planted in pots, overwatering is a common issue. If you accidentally overwater your Scrub mahogany, you should take immediate steps to address the situation. First, stop watering the plant right away to minimize the impact of the overwatering. Then, inspect the roots by removing the plant from its pot. If there is no sign of root rot, you can return the plant to its container. However, if there is root rot, trim the affected roots and consider applying a fungicide to prevent further damage. Finally, repot the Scrub mahogany in well-draining soil. On the other hand, underwatering is a more easily manageable problem. When a Scrub mahogany is underwatered, its leaves will droop, dry out, and fall off. However, with sufficient watering, the leaves will quickly regain their fullness. Therefore, it is important to adjust your watering frequency promptly when you notice underwatering.

How important is artificial lighting for Scrub Mahogany's growth?

Artificial lighting becomes crucial for Scrub Mahogany, especially when natural sunlight is insufficient, like during winter or in spaces with less exposure to sunlight. Indoor plants benefit significantly from artificial lights, such as LEDs, which can be customized to emit specific wavelengths necessary for the plant's growth. For plants needing full sun, 30-50 watts per square foot of artificial light is recommended, for partial sun 20-30 watts, and for full shade 10-20 watts. The correct distance (12-36 inches above the plant) and duration (8-12 hours a day) of light exposure are key factors in mimicking natural sunlight conditions.

How frequently should I water my Scrub mahogany?

Most plants can thrive with natural rainfall, but if your area has a lack of rain, you should water your plants every 2 weeks in spring and fall. In summer, you will need to water them more frequently, while in winter, when growth is slower and water needs decrease, you can water them less often or not at all. Be sure to water young or newly planted Scrub mahogany more often to support their establishment and growth. For potted plants, there are two main ways to determine watering frequency for your Scrub mahogany. One way is to follow a set schedule, such as watering once a week or every other week. However, this approach may not consider the specific conditions of your growing environment. Another option is to monitor the soil moisture and water when the top two to four inches of soil in the pots have completely dried out. Remember that during summer, the plant's water needs will be higher, so a predetermined schedule may not be sufficient.

What are the symptoms of inadequate light for Scrub Mahogany?

Scrub mahogany, when not receiving sufficient sunlight, exhibits symptoms like smaller new leaves, leggy or sparse growth, faster leaf drop, halt in new growth, lighter-colored or pale leaves indicating a lack of chlorophyll, chlorosis (leaves turning yellow), sunscald, leaf curling as a defense against too much sun, wilting from excessive transpiration, and leaf scorching. These symptoms reflect the plant's struggle with suboptimal lighting conditions.

How much water should I give my Scrub mahogany plant?

To properly water your Scrub mahogany, it's important to adjust the amount of water based on its needs. Rather than always giving it a large amount of water, you can support healthy growth by providing five to ten ounces of water when only a few inches of soil have dried since the last watering. You can gauge the soil moisture to determine the appropriate water volume by observing how many inches of soil have dried out between waterings. To ensure the Scrub mahogany receives adequate moisture, it's recommended to moisten all the dry soil layers since the last watering. If more than half of the soil has become dry, it's a good idea to increase the water amount. In such cases, continue adding water until excess water drains from the pot's holes. If the Scrub mahogany is outdoors in an area with sufficient rainfall, it may not require additional watering. However, when it's young or establishing, it's advisable to provide 1-2 inches of rain per week. As it grows, it can rely on rainwater, only requiring a full watering if there is a prolonged period with no rainfall and hot weather to prevent stress.

What are the solutions for Scrub Mahogany struggling with light conditions?

To counteract the lack of sunlight, gradually moving indoor plants to sunnier locations each week until they receive at least 6 hours of direct sunlight is recommended, utilizing south-facing windows and keeping curtains open for maximum exposure. Artificial lighting, such as desk lamps or professional grow lights, can also be used for at least 8 hours daily. Outdoors, it's advisable to move plants to sunnier spots gradually to prevent sunburn. Reducing obstructions, like pruning trees, or transplanting smaller plants during their dormant period to sunnier locations with good drainage, helps improve light exposure. Note that parts of the plant affected by low light might not recover, but new growth should be healthy with improved light conditions.

How can I know if I'm giving my Scrub mahogany enough water?

When it comes to the Scrub mahogany, overwatering is a more common problem. There are clear signs to look for when this happens: yellowing leaves, leaf dropping, and shriveling of the plant's structure, potentially leading to root rot. On the other hand, an underwatered Scrub mahogany will also wilt and have brown or brittle leaves. Regardless of whether you observe signs of overwatering or underwatering, intervention is necessary to restore your Scrub mahogany's health.

How should I water my Scrub mahogany at different stages of growth?

When the Scrub mahogany is young and in its seedling stage, it requires more water compared to when it is mature. It is crucial to keep the soil consistently moist during the early stages to promote root development. This also applies when you transplant the Scrub mahogany to a new location. Additionally, proper care can result in the development of beautiful flowers and fruits. If your Scrub mahogany is in the flowering or fruiting phase, you may need to increase watering slightly to support these structures.

How do I water my Scrub mahogany throughout the year?

The amount of water you need to give your Scrub mahogany plant will vary depending on the season. In the summer, when it's hot and sunny, you'll likely need to water it more often because the soil can dry out faster. On the other hand, in the winter when the plant isn't actively growing, you can water it less frequently, maybe every 2 to 3 weeks or even skip watering altogether. If you have the plant indoors, be cautious of appliances like air conditioners, as they can make the plant dry out faster and require more frequent watering.

What is the difference in watering my Scrub mahogany inside or outside?

If your Scrub mahogany is growing outside and receives sufficient rain, it may not require additional watering. However, if you live in an area with little rain, it is advisable to water the plant every two weeks. If you are located outside the plant's natural hardiness zone, it is best to grow it indoors. Indoors, you should be mindful of the plant's soil as it can dry out faster in containers or near HVAC units like air conditioners. Due to these drying factors, you will need to water the plant more frequently compared to growing it outdoors.

PLATES
Intsia bijuga leaf
PLATE 01 · leaf
Intsia bijuga leaf
PLATE 02 · leaf
Intsia bijuga flower
PLATE 03 · flower
Intsia bijuga fruit
PLATE 04 · fruit
Intsia bijuga fruit
PLATE 05 · fruit
ALSO IN THE LIBRARY

You might also like.