Cercidiphyllum japonicum
Katsura · Katsura tree · Red Katsura
Description
Source: leafsnapCercidiphyllum japonicum, commonly known as the Katsura tree, is a deciduous tree native to Japan and China. This medium-sized tree can grow up to 20–30 meters tall and has a broad, spreading crown. Its heart-shaped leaves are particularly striking, with a blue-green color in spring that turns yellow or orange in the fall. One of the most distinctive features of the Katsura tree is its fragrance. When the leaves fall in autumn, they release an aroma reminiscent of caramel or cotton candy. Additionally, the bark is smooth and adorned with vertical stripes, adding another layer of visual interest. The Katsura tree thrives in moist soil conditions but can tolerate some drought once established. It grows best in full sun but can also endure partial shade. This plant has various uses, including ornamental purposes due to its attractive foliage and unique fragrance, as well as for timber production thanks to its strong wood. Overall, Cercidiphyllum japonicum is a fascinating and versatile plant with numerous desirable features, making it popular among gardeners worldwide.
💡 The Katsura tree is a low-maintenance ornamental tree that flourishes in temperate regions. While it does produce white flowers, they are small and not very noticeable. The tree is best known for its striking fall foliage and its unique fragrance, reminiscent of brown sugar. As a slow-growing deciduous tree, it will shed its leaves when frost arrives in the fall.
🌳 In residential landscaping, the katsura tree is valued not only for its striking autumn foliage but also for the unexpected sweet aroma—reminiscent of burnt sugar or cotton candy—that its leaves emit as they turn. This distinctive scent increases the katsura's desirability, offering a multisensory appeal. The pleasant fragrance is often strongest when the leaves begin to fall, forming a naturally fragrant carpet and turning ordinary backyards into aromatic retreats as the days shorten.
🎭 Union of earth and sky
Care Guide
💧 Water Every 7 days
The Katsura tree flourishes in moist environments, preferring consistent moisture while also having moderate drought tolerance. To avoid over-saturation, water the tree every two weeks. Typically grown outdoors, the Katsura tree releases a sweet scent during dry spells and turns a beautiful golden color in the fall, adding to the garden's appeal.
What's the best way to water my Katsura tree?
To ensure excellent root development, consider these watering tips for your plants: 1. Place a garden hose at the base of the plant, avoiding direct spraying of the leaves. 2. Outdoor plants under direct sunlight may need more water for their leaves. 3. Use bubblers to moisten the roots of each plant, or use soaker hoses to cover the entire garden or bed when adding or removing plants, allowing for deep root penetration. 4. After watering, drain any excess water and wait for the soil to dry before watering again. 5. Water at ground level to prevent diseases. 6. On sunny days, you can spray the entire bush with water. 7. Whether potted or in-ground, remember that the Katsura tree prefers deep watering rather than light sprinkling.
What do I need to do if I give too much or too little water to a Katsura tree?
When a Katsura tree is overwatered, it can display yellowing, dropping, and wilting leaves. The plant may also appear dull and unhealthy, with mushy stems. If you notice these signs, try adjusting your watering schedule as necessary. On the other hand, wilting can also be a sign of under watering. In this case, leaves will become crispy and dry. To determine if the soil is dry, you can check it and if watering alone is inadequate, give the tree a thorough watering. This will help the tree recover, but keep in mind that the damaged root system may cause the leaves to remain dry and yellow for a few days. Once the plant returns to normal, the yellowing of the leaves will cease. It is important to regularly check the moisture levels when the Katsura tree is indoors. Avoid overwatering in indoor environments and watch out for black spots, which may indicate the need for a few days of rest from watering to let the soil dry. Overwatering can lead to root rot, so if you notice discolored and slimy roots, consider transferring the tree to a different pot. It is always best to prevent root rot by avoiding overly soggy soil. When planting the Katsura tree outdoors, make sure to dig a little deeper. If the soil feels dry when you check with your fingers, it may indicate underwatering. Adequate watering is necessary to aid in the tree's recovery.
How frequently should I water my Katsura tree?
The Katsura tree prefers deep and infrequent watering, especially when in pots. Since the water storage in pots is limited and the soil dries out quickly, it is recommended to soak them in a gallon of water each time. In cold regions, watering is required every 3 to 5 days. It's best to water the plant early in the morning when the soil is dry, both indoors and outdoors. To determine if watering is needed, check the soil inside the pot. If the top 2-3 inches of soil is dry, it's time to water the plant thoroughly. During hot days, check the moisture daily as the heat can dry out the soil quickly. If you have a garden, irrigation of the soil is necessary, especially in hot climates where watering once a week is recommended. Only water the plants when you notice about 2 to 3 inches of soil becoming too dry, whether indoors or outdoors. Take into consideration the amount of rainfall, as excessive watering can lead to root rot. Katsura trees usually grow during spring and fall, so adding mulch about 3 to 4 inches deep can help conserve water when they are outdoors. Sandy soil requires more frequent watering due to its faster drainage, whereas clay soil requires less frequent watering to avoid root rot. To keep track of watering, mark the date on the calendar and pay attention to drooping leaves, as they may indicate that watering is needed.
How much water does my Katsura tree need?
The Katsura tree has specific watering needs. For potted plants, water them deeply until you see water dripping from the bottom of the pot. Wait for the soil to dry before watering again. You can use a water calculator or moisture meter to determine how much water you have given your plant in a week. During the flowering period, provide plenty of water but allow the moisture to evaporate to prevent root rot. If the Katsura tree is planted outdoors and receives enough rainfall, it may not need additional watering. However, when the tree is young or newly planted, make sure it receives 1-2 inches of rain per week. As the tree grows, it can rely on rainfall alone. Only during hot weather or extended periods without rain for 2-3 weeks, consider giving the tree a thorough watering during cooler times of the day to avoid heat damage. Additional watering will be necessary during long dry spells.
Should I water my Katsura tree more or less in different seasons or climates?
The Katsura tree needs rain when it's outdoors, but only needs watering during persistent dry weather. In the spring and fall, the soil should be kept moist but not waterlogged. Alternating between dry and moist soil conditions helps the Katsura tree grow well. In the hot summer, water evaporates quickly, so you may need to water more often to keep the soil moist if there's a lack of rainfall. During winter, the Katsura tree needs less water because it's dormant. Use a well-draining soil mix, like terracotta, to help water evaporate faster when the tree is dormant. Once the tree starts growing and goes dormant, you can stop watering and rely on fall and winter rains to keep it alive throughout the dormant period. After spring, encourage growth and blooming by cultivating and watering the Katsura tree when the temperature warms up. Good drainage is important, especially during winter, to prevent waterlogging. If the tree is in a pot, make sure it has adequate drainage and water it well, especially in summer. Avoid shallow sprinkles that only reach the leaves, as they can encourage fungal growth and don't reach the roots. Even during dormancy, don't let the tree dry out completely. Avoid overwatering, as the Katsura tree doesn't like sitting in water for too long. Poor drainage can cause the tree to die in winter. Applying mulch can help reduce stress, conserve water, and promote healthy blooms.
☀️ Light Full sun
Katsura tree grows best with plenty of sunlight, though it can survive in locations with only moderate sun. Its healthiest development occurs when it is placed under an open sky. It comes from areas that receive substantial sunlight. Excessive sun exposure can be damaging, while too little light can slow its growth and development.
What are the sunlight requirements for a Katsura tree?
A Katsura tree flourishes under full sun, which is above 6 hours of sunlight a day, but it also tolerates partial sun, about 3-6 hours of sunlight. It is originally from environments that receive considerable sunlight, meaning ample exposure ensures its healthiest growth. Yet, it is important to balance light exposure as overexposure can damage the plant, while insufficient light might stunt its growth. Observing how sunlight moves through your garden and selecting locations that offer a good mix of light and shade will benefit your Katsura tree's wellbeing.
How can artificial lighting be used for indoor Katsura trees?
Indoor Katsura trees require adequate lighting to grow optimally, especially when natural sunlight is insufficient, such as during winter or in less sunny spaces. Artificial lights, like LED lights customized to provide specific wavelengths, serve as a vital growth support. For full sun plants, 30-50W/sq ft of artificial light is recommended, 20-30W/sq ft for partial sun plants, and 10-20W/sq ft for full shade plants. The light source should be placed 12-36 inches above the plant, mimicking the distance of natural sunlight, and should remain on for 8-12 hours per day to simulate natural daylight hours.
What are the common symptoms of poor lighting on a Katsura tree?
When a Katsura tree experiences insufficient light, it may exhibit symptoms such as producing smaller leaves, experiencing leggy or sparse growth, shedding older leaves prematurely, showing stunted or no new growth, and developing pale or irregularly colored new leaves. Extreme sunlight can lead to chlorosis, sunscald, leaf curling, wilting, and leaf scorching. These symptoms indicate a lack of chlorophyll and essential nutrients due to inappropriate lighting conditions, either too much or too little.
What are the suggested solutions for correcting poor light conditions for Katsura trees?
To optimize a Katsura tree's growth in poor lighting conditions, gradually increase its light exposure. For indoor plants, move them to a sunnier spot each week, aiming for at least 6 hours of direct sunlight daily, using a south-facing window for natural light, or artificial lighting for at least 8 hours a day if the plant can't be moved easily. Outdoors, adopt a gradual adjustment to sunnier locations to prevent sunburn. If sunlight is blocked by trees, consider pruning to let more light through. For small plants, transplanting during dormant periods, in late winter or early spring, to a sunnier spot with good drainage can also be beneficial. Note that parts of the plant already affected by poor light may not recover, but new growth should be healthy.
🌡️ Temperature 5–32.2°C
The katsura tree does best in temperatures between 41 and 89.6℉ (5 to 32℃). It originates from regions with a temperate climate. In winter it can benefit from protection against frost, and in summer it prefers some shade during the hottest part of the day.
What are the temperature requirements for a Katsura tree?
The Katsura tree, or Cercidiphyllum japonicum, thrives in temperatures ranging from 41 to 89.6°F (5 to 32°C), indicating its preference for a temperate climate. It exhibits strong cold resistance but should be protected against temperatures that drop below -30°C (-22°F) to prevent potential damage. During the summer, to cope with high temperatures, the tree benefits from some shade, particularly during the hottest part of the day. Adequate measures, such as wrapping the trunk and branches with suitable materials and ensuring the soil is moist before the first freeze, can help the tree stay healthy through various seasons.
How should I care for my Katsura tree during extreme cold?
The Katsura tree can generally tolerate cold well, but it's advised to take precautions if winter temperatures are expected to fall below -30°C (-22°F). Wrapping the tree's trunk and branches in non-woven fabric or cloth can offer protection. Additionally, watering the tree abundantly before the first freeze of autumn helps maintain soil moisture, which is crucial for the plant's survival during cold winters. This preparation aids in preventing drought stress and supports the tree through the winter and early spring months.
What are the signs of temperature stress in Katsura trees and how can I address them?
Signs of temperature stress in Katsura trees vary with the temperature extremes. In case of low temperatures, particularly when it drops below -30°C, the branches may become brittle and dry, and might not produce new shoots in spring. Pruning dead branches can encourage healthy growth. During high temperatures, especially above 35°C, the leaves might lighten in color, become dry or wither, and the tree may suffer from sunburn. To mitigate this, trim away the damaged parts, provide shade during the peak sun hours, and ensure the soil remains moist by watering in the morning and evening.
💨 Humidity
🪴 Soil 6-7
🌱 Fertilizer
Fertilize your Katsura tree in early spring to encourage healthy growth. Regular fertilization improves overall health, resulting in vigorous growth, greater resilience to harsh conditions, and enhanced resistance to pests and diseases. Maintain a specific fertilization schedule for your Katsura to keep its foliage vibrant with deep color and a lush appearance.
Why should I put fertilizer on my Katsura tree?
No matter what kind of Katsura tree you have, regular fertilization is crucial for its overall health. By providing the right nutrients, your tree will grow stronger and be better equipped to handle challenging growing conditions, as well as resist diseases and pests. Maintaining the beautiful foliage of your Katsura tree is important, so it's recommended to follow a consistent fertilization schedule that suits your specific tree. This will promote vibrant and lush leaves in a deep color.
When should I fertilize my Katsura tree?
To keep your Katsura tree healthy, fertilize it for the first time in late winter or early spring. This will provide the necessary nutrients for the tree to grow well when the weather warms up. If you live in a warm climate, it's also helpful to give the tree another dose of fertilizer in early fall. This not only adds nutrients for the next growing season, but also helps the tree withstand the winter and avoid damage to its foliage. Fertilizing earlier in the season ensures that the new branches have enough time to grow strong before the cold winter arrives.
When should I not put fertilizer on my Katsura tree?
There are specific times of the year when you should avoid fertilizing your Katsura tree. The first instance is during the winter months when the tree is dormant and does not require any feeding. It is also not recommended to fertilize the tree in late spring and throughout summer. This period tends to have hotter and drier weather conditions, which can lead to negative reactions if the tree is fertilized. To prevent these issues, it is advisable to follow a fertilization schedule that only involves feeding in early spring and early fall.
What kind of fertilizer should I use for my Katsura tree?
A Katsura tree primarily requires nitrogen for its growth, but phosphorus and potassium shouldn't be disregarded. These three nutrients are all important for the tree, so using a balanced fertilizer like 10-10-10 is effective. However, a more customized nutrient ratio often yields the best growth for a Katsura tree, with slightly higher nitrogen content being beneficial. A ratio like 10-6-4 can work well. When fertilizing, you have the option of using either granular or liquid fertilizer.
How can I give my Katsura tree nutrients?
To properly fertilize your Katsura tree, choose between using granular or liquid fertilizer. If you opt for granular fertilizer, simply sprinkle it on the soil at the right time. The slow-release quality of granular fertilizer will gradually release nutrients into the soil. It's advisable to lightly water your tree before applying fertilizer. Using liquid fertilizer is less common, but if you prefer this method, mix the fertilizer with water and pour it around the base of your tree. In some cases, it's helpful to conduct a soil test before fertilizing to determine if any adjustments to pH levels are necessary.
🪴 Pot & Repot 2-3 years
When repotting a Katsura tree, pick a pot 1–2 inches (2.5–5.1 cm) larger with ample drainage. Use a well-draining potting mix. Repot in spring or fall, making sure the root ball sits slightly lower than the rim of the flower pot. Water thoroughly after repotting and place in a warm spot with indirect sunlight.
✂️ Pruning
The Katsura tree boasts heart-shaped leaves and vibrant fall colors. To keep the tree healthy, prune it in early spring. This allows you to remove any dead wood and shape the tree gently. However, avoid heavy pruning, as it can stress the tree. Regular pruning helps improve air circulation and sunlight exposure. Be sure to use clean, sharp tools to avoid causing damage to the tree.
🌿 Propagating
🐛 Diseases & pets
☠️ Toxicity
Katsura tree has no reported toxic effects on humans and pets, making it a safe addition to your garden.
Characteristics
- Plant Type
- Tree
- Life Cycle
- Perennial
- Genus
- Cercidiphyllum
- Family
- Cercidiphyllaceae
- Hardiness Zone
- 4-8
- Mature Height
- 10.06 m to 45.11 m
- Mature Spread
- 7.62 m to 10.36 m
- Leaf Color
- Green, Blue, Yellow, Red, Orange, Purple, Bronze
- Leaf Type
- Deciduous
- Flower Color
- Red, Pink
- Flower Size
- 0.25 cm to 0.51 cm
- Bloom Time
- Mid spring, Late spring
- Planting Time
- Spring, Autumn
- Harvest Time
- Mid summer
- Native Area
- Japan, China