Koelreuteria elegans, more commonly known as flamegold rain tree or Taiwanese rain tree, is a deciduous tree 15–17 metres tall endemic to Taiwan. It is widely grown throughout the tropics and sub-tropical parts of the world as a street tree. It flowers in early to mid-summer. Flowers are small, to 20 mm in length, and occur in branched clusters at the stem tips. They are butter-yellow with five petals that vary in length until opening. Each flower contains seven to eight pale yellow stamens with hairy white filaments. The fruit is a brown-purplish three-lobed capsule that splits to reveal a number of black seeds. It is a declared weed in many parts of the world, particularly Brisbane, Australia and in Hawaii.
Flamegold rain tree has strong disease resistance and is usually not susceptible to illnesses. Regarding care, this plant is fairly low-maintenance. When grown outdoors it needs only light watering, and larger specimens generally do not require pruning; however, smaller plants should be pruned after they have finished blooming. Flamegold rain tree is suitable for anyone with an outdoor area, such as a garden or deck, and does not demand much care experience.
How to keep Koelreuteria Elegans.
Light
Sustained by abundant sunlight, the flamegold rain tree thrives when it receives daily exposure to the sun’s rays. Native to regions with plentiful sunshine, it prospers in its naturally sun-drenched habitat. Insufficient light can stunt its growth, while excessive exposure may scorch its leaves.
Water
The flamegold rain tree comes from regions that experience both wet and dry seasons, enabling it to adapt to changing water availability. Once established, this tree is drought-tolerant and needs watering only every two weeks. It thrives outdoors, particularly in temperate climates with seasonal rainfall patterns similar to its native environment.
Temperature
Flamegold rain tree is a plant that does best in temperatures from 68 to 100.4 °F (20 to 38 ℃). These conditions reflect its native habitat, so colder regions may need adjustments. In winter, provide extra warmth with heaters or controlled environments.
Fertilizer
The best time to fertilize a Flamegold rain tree is in early spring when it comes out of dormancy. This encourages overall growth and flower development. Fertilizing improves the foliage, stems, and branches, and promotes flowers that are large, vibrant, and long-lasting. It also helps move nutrients from the roots to the flowers and enhances the plant’s health and resistance to disease.
Pruning
The Flamegold rain tree is known for its vibrant yellow flowers and should be pruned in early spring. Important techniques for pruning include removing dead branches and thinning crowded areas to improve airflow. These practices encourage healthy growth, help maintain the tree’s shape, and make garden management easier.
Botanical profile.
- Plant Type
- Tree
- Life Cycle
- Perennial
- Genus
- Koelreuteria
- Family
- Sapindaceae
- Hardiness Zone
- 9-11
- Mature Height
- 14.94 m to 17.07 m
- Mature Spread
- 9.14 m to 14.94 m
- Leaf Color
- Light Green, Dark Green
- Leaf Type
- Deciduous
- Flower Color
- Yellow
- Flower Size
- 0.51 cm
- Bloom Time
- Early spring, Mid spring, Late summer, Fall, Winter
- Planting Time
- Spring, Autumn
- Harvest Time
- Late spring, Early summer, Mid summer
Other names.
Reader questions.
What's the best way to give water to my Flamegold rain tree?
To ensure excellent root development, place a garden hose at the base of the plant but avoid spraying the leaves directly. If the plants are outdoors and in direct sunlight, the leaves will need more water. Consider using bubblers or soaker hoses to moisten the roots. When adding or removing plants, use soaker hoses that cover the entire garden or bed to help roots grow deeply. Remember to drain any excess water and wait for the soil to dry before watering. Water at ground level to prevent diseases. On sunny days, consider spraying the entire bush with water. Whether potted or in-ground, keep in mind that the Flamegold rain tree prefers deep watering rather than light sprinkling.
Why should I put fertilizer on my Flamegold rain tree?
Fertilization plays a crucial role in maintaining the overall health and well-being of a Flamegold rain tree. By providing the necessary energy and nutrients, the tree can develop abundant foliage and robust stems and branches. Gardeners particularly value the flowers of the Flamegold rain tree, and fertilization is beneficial in ensuring that these flowers are not only large and vibrant, but also long-lasting. This is because the right fertilizer facilitates the efficient transport of fuel from the roots to the flowers through the stems. Additionally, proper fertilization helps to keep the overall health of the tree in good condition, enhancing its ability to resist diseases.
How much sunlight does the Flamegold rain tree need to grow?
Tropical ornamental plants that thrive in full sun require at least 6 hours of direct sunlight each day. These plants are well-suited to areas with strong and direct sunlight, as they need this light to flourish. In their natural habitats, they tend to grow in open fields or along forest edges, where they can enjoy abundant sunlight all day long.
What temperature is best for Flamegold rain tree?
To help your tropical plants thrive, it's best to maintain a temperature range of 75℉ to 90℉ (25-32℃). While different species can tolerate temperatures outside this range, sticking within a few degrees of these limits will ensure optimal growth. However, there are extreme temperature limits to be aware of. Anything below 50℉ (10℃) or above 95℉ (35℃) can hinder growth and cause issues with the leaves and stems. Low temperatures are particularly damaging, as even a light frost can lead to the death of your tropical plants. In fact, cellular death can occur rapidly, with some species dying within 12 to 24 hours.
What should I do if I give too much/not enough water to the Flamegold rain tree?
An overwatered Flamegold rain tree may display yellow, dropping, and wilting leaves. The plant may also look dull and unhealthy, with mushy stems. When these signs appear, it's best to adjust your watering schedule. Additionally, wilting can also indicate under watering, characterized by crispy and dry leaves. In such cases, check the soil and water thoroughly if it's dry. While sufficient watering will help the Flamegold rain tree recover, it may still appear dry with yellow leaves due to root damage. Once it returns to normal, the yellowing of leaves will stop. When keeping the Flamegold rain tree indoors, always monitor moisture levels and avoid overwatering. If you notice black spots, allow the soil in the pot to dry for a few days. Overwatering can lead to root rot, so consider transferring the plant to a different pot if you observe discolored and slimy roots. Prevent root rot by avoiding excessively soggy soil. When planting the Flamegold rain tree outdoors, check the soil moisture by digging a little deeper. If the soil feels too dry, it may indicate underwatering, requiring adequate watering for plant recovery.
When should I fertilize my Flamegold rain tree for the best results?
To effectively fertilize a Flamegold rain tree, the best time is during early spring when the plant is transitioning out of dormancy and preparing for bud growth. Feeding at this time will provide the necessary energy for overall growth and flower development. However, it is also beneficial to do a smaller feeding at the end of the season in fall. Fertilizing during planting is optional and not always required by gardeners.
What happens if the Flamegold rain tree doesn't get enough sunlight?
Tropical ornamental plants that need full sun may face issues if they don't receive enough sunlight. They might become leggy and weak, and their leaves could turn yellow or pale. Furthermore, they may stop producing flowers. Ultimately, if these plants continue to lack the required amount of direct sunlight, there is a possibility that they may die.
Does the Flamegold rain tree need different temperatures at different stages of growth?
Flamegold rain tree can transition between growing phases without temperature changes, but consistency is key. Fluctuating temperatures can slow down its growth, regardless of its current phase. Therefore, it is best to keep the tree in a controlled environment. Maintaining an optimal temperature range between 75℉ and 90℉ (25-32℃) is crucial, with a focus on staying above the lower limit. While temperatures above 90℉ (32℃) are not ideal, the tropical plant can tolerate them to some extent. However, temperatures dropping below 50℉ (10℃), especially 40℉ (5℃), can cause direct damage to this heat-loving plant species.
How frequently should I water my Flamegold rain tree?
The Flamegold rain tree prefers deep and infrequent watering. It is recommended to soak them in a gallon of water, especially if they are planted in pots. Potted plants have limited water storage and the soil dries out quickly. In cold regions, watering is required every 3 to 5 days. Water the tree early in the morning when the soil is dry, whether it's indoors or outdoors. To determine if watering is needed, check the soil. If the top 2-3 inches are dry, it's time to water the plant thoroughly. On hot days, check the moisture daily as the heat can dry out the soil in the pot quickly. If you have a garden and live in a hot climate, water the rain tree once a week. Only water when you notice that about 2 to 3 inches of soil has become too dry. Take the amount of rainfall into consideration and avoid overwatering to prevent root rot. If there is a lot of rainfall, additional watering may not be necessary. The Flamegold rain tree typically grows during spring and fall. When the tree is outdoors, adding a layer of mulch 3 to 4 inches deep can help conserve water. Sandy soil requires more frequent watering, while clay soil can be watered less frequently to avoid root rot. You can mark the date on the calendar whenever you water and pay attention to drooping leaves, which may indicate that watering is needed.
When is it not a good time to add fertilizer to my Flamegold rain tree?
During winter, you don't need to fertilize your Flamegold rain tree since it is in a dormant phase and doesn't require much energy from the soil to grow. Fertilizing during this time can lead to overfertilization and negative effects. The best times to feed your Flamegold rain tree are early spring and fall. Therefore, during most of the spring and summer, fertilization is not necessary. It's also advisable to avoid feeding if the plant is exposed to excessively hot or dry conditions.
What happens if the Flamegold rain tree gets too much sunlight?
Tropical ornamental plants that thrive in full sun require ample direct sunlight, but excessive exposure to intense sunlight can harm them. Prolonged periods of direct sunlight can cause sunburned leaves or the development of unsightly brown spots. Additionally, if the soil dries out too rapidly in full sun, these plants may become dehydrated.
Does the Flamegold rain tree require varying temperatures depending on the season?
The Flamegold rain tree does not require different temperatures for different seasons, making it easier to care for. The most important aspect of seasonal care is maintaining the optimal temperature range. Keeping this plant indoors is recommended because it allows you to control the temperature regardless of the outside climate. Additionally, light is crucial for tropical species, including the Flamegold rain tree. These plants thrive in a partial shade environment where the sunlight is dappled or filtered. Bright but indirect light is the ideal option when growing these plants indoors, as too much direct sunlight can harm the leaves and stunt growth.