Cladrastis kentukea
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Cladrastis kentukea

Kentucky Yellowwood · Yellowwood · Kentucky Yellow-wood · American Yellow-wood · Virgilia

Tier 1 Difficulty: easy Water: low Light: full_sun Toxicity: low
Water every
10 days
Temperature
5–35 °C
Soil pH
5–7
Hardiness
Zone 4–13
Click count
910
Observations
292

Description

Source: leafsnap

Cladrastis kentukea, the Kentucky yellowwood or American yellowwood (syn. C. lutea, C. tinctoria), is a species of Cladrastis native to the Southeastern United States, with a restricted range from western North Carolina west to eastern Oklahoma, and from southern Missouri and Indiana south to central Alabama. The tree is sometimes also called Virgilia.

🌳 Beyond its ornamental appeal, yellowwood is an underutilized source of specialty timber, prized for its rot resistance and attractive grain, making it suitable for fine furniture and interior finish work. It also serves a role in wildlife-friendly landscaping by providing nectar for pollinators and contributing to habitat diversity. Its potential for additional uses—such as extracting essential oils or functioning as a bioindicator because of its response to certain soil compositions—remains largely unexplored.

🎭 fall

Care Guide

💧 Water Every 1-2 weeks

Yellowwood thrives in areas with moderate rainfall and can easily adapt to consistent moisture, as long as it doesn't become waterlogged. It's best to water it every 1 to 2 weeks, allowing the soil to dry out slightly between waterings. For optimal outdoor growth, be sure to adjust your watering schedule based on the seasonal rainfall patterns.

Suggested frequency: Every 1-2 weeks
FAQ
What is the best way to water my Yellowwood plant?

To promote excellent root development in your plants, consider using a garden hose at the base of each plant. Avoid spraying the leaves directly and keep in mind that outdoor plants in direct sunlight will need more watering. You can also use bubblers or soaker hoses to keep the roots moist. After adding or removing plants, use soaker hoses that cover the entire garden or bed to help the roots grow deeper. Make sure to drain any excess water and wait for the soil to dry before watering again. Watering at ground level will help prevent diseases. On sunny days, it might be beneficial to spray the entire bush with water. Whether your plants are potted or in the ground, remember that Yellowwood prefers deep watering rather than light sprinkling.

If I give Yellowwood tree too much or too little water, what should I do?

When a Yellowwood plant is overwatered, it may show signs such as yellowing leaves that drop off and wilt. The plant may also appear dull and unhealthy, with mushy stems. To address these issues, it's best to adjust your watering schedule if possible. However, wilting can also occur due to under watering. In this case, the leaves may turn crispy and dry. If the soil is dry and simply watering is not sufficient, it's important to thoroughly water the plant. This will help the Yellowwood recover, but the plant may still have dry and yellow leaves for a few days due to root damage. Once it returns to normal, the yellowing of leaves should stop. When caring for a Yellowwood plant indoors, always check the moisture levels in the pot. Avoid overwatering and look out for black spots, which indicate excessive moisture. If black spots are present, allow the soil to dry out by refraining from watering for a few days. Overwatering can lead to root rot, so if you notice discolored and slimy roots, consider transferring the plant to a different pot. It's important to prevent root rot by avoiding overly soggy soil. When planting a Yellowwood outdoors, make sure to dig a little deeper. If you find that the soil is too dry when checking with your fingers, it may be a sign of underwatering. Adequate watering is necessary to facilitate the plant's recovery.

How much should I water my Yellowwood tree?

The Yellowwood prefers deep and infrequent watering, especially if they are in pots. Soaking them in a gallon of water each time is recommended. Potted plants have limited water storage and their soil dries out quickly. In cold regions, water the Yellowwood every 3 to 5 days. Water in the morning when the soil is dry, whether it's indoors or outdoors. To determine if watering is necessary, check the soil's moisture level. When 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 pot's soil can dry out rapidly. If you have a garden, irrigate the soil accordingly. In hot climates, watering once a week may be sufficient. Only water when about 2-3 inches of soil become too dry both indoors and outdoors. Consider the amount of rainfall and avoid overwatering to prevent root rot. Yellowwood typically grows during spring and fall. When outdoors, adding mulch 3 to 4 inches deep helps conserve water. Sandy soil requires more frequent watering due to its fast drainage. On the other hand, clay soil requires less frequent watering and can tolerate 2-3 days without watering to prevent root rot. Remember to mark the date on the calendar for watering and be mindful of drooping leaves as a sign of potential delay.

How much water does my Yellowwood tree need?

The Yellowwood tree typically requires about a gallon of water on a regular basis. When it comes to potted plants, it is recommended to water them deeply until you notice water dripping from the bottom of the pot. Afterward, allow the soil to dry before watering them again. You can use a water calculator or moisture meter to keep track of how much water you have given your plant in a week. During the flowering period, make sure to provide ample water, but allow the moisture to evaporate to avoid root rot. If you have planted the Yellowwood tree outdoors in an area with sufficient rainfall, it may not need any additional watering. However, for young or newly planted Yellowwood trees, it is important to ensure they receive 1-2 inches of rain per week. As the tree continues to grow, it can rely solely on rainfall. Only when the weather is exceptionally hot or there has been no rain for 2-3 weeks should you consider giving the Yellowwood tree a thorough watering during a cooler part of the day to prevent damage from excessive heat. Additional watering will be necessary during prolonged dry spells.

Should I change how often I water my Yellowwood tree based on different seasons or climates?

The Yellowwood plant prefers outdoor conditions and generally relies on rainfall for watering. However, during dry weather, you may need to water it more often. In the spring and fall, the soil should be moist but not soggy to support growth. Alternating between dry and moist soil conditions is beneficial for the Yellowwood. In the summer, hot weather can cause water to evaporate quickly, so additional watering may be necessary. During winter, the Yellowwood requires less water as it goes dormant. It is recommended to use a well-draining soil mixture, like terracotta, to help with evaporation. Once the Yellowwood starts leafing out in the spring, watering can be reduced, and it can rely on rainfall for survival during dormancy. Good drainage is important, especially in winter, to prevent waterlogging. When the plant is in a pot, it has limited root growth, so regular watering is necessary, particularly in summer. Deep soaking the root system once or twice a week is preferable to shallow sprinkling, as it prevents fungal growth and reaches the roots effectively. It is essential to avoid complete drying out of the Yellowwood, even during dormancy in fall and winter. Avoid overwatering, as it can lead to root problems. Applying mulch helps conserve water, reduce stress, and promote healthy blooms.

☀️ Light Full sun

Yellowwood does best with a high level of daily sun exposure, which promotes healthy growth and development. This requirement is the same throughout all growth stages. Native to regions with abundant sunlight, it can also tolerate areas with moderate sun. Both insufficient and excessive sun exposure can harm the plant's health.

Ideal: Full sun
FAQ
What are the sunlight requirements for Yellowwood (Cladrastis kentukea)?

Yellowwood requires a significant amount of sunlight to thrive, ideally in full sun exposure for optimal growth and development throughout all its growth stages. It originates from zones with abundant sunlight but can also adapt to areas with moderate sun coverage. Both insufficient and excessive sunlight can negatively affect the plant's health. The plant should receive more than 6 hours of sunlight for 'full sun' conditions and about 3-6 hours for 'partial sun' conditions. It's crucial to observe how sunlight moves through your garden, selecting locations that provide a balance of light and shade to ensure the well-being of your plants.

How can artificial lighting be used for Yellowwood if natural sunlight is insufficient?

When natural sunlight is not enough, particularly during winter or in less sunny spaces, artificial lighting can be a vital solution for Yellowwood's growth. Adequate lighting is crucial for indoor plants to promote faster, healthier growth. LED lights are recommended because they can be customized to provide specific wavelengths of light needed for plants. Full sun plants require 30-50W/sq ft of artificial light, while partial sun plants need 20-30W/sq ft. The light source should be placed 12-36 inches above the plant to mimic natural sunlight, and most plants benefit from 8-12 hours of light per day to mimic the length of natural daylight hours for the species.

What are the symptoms of insufficient or excessive sunlight exposure in Yellowwood?

Yellowwood may show several symptoms if it doesn't receive optimal sunlight. Insufficient light can lead to smaller new leaves, leggy or sparse growth, faster leaf drop, slower or no new growth, and lighter-colored or chlorotic leaves. Excessive sunlight can cause chlorosis, sunscald, leaf curling, wilting, and leaf scorching — indications of damage or stress due to too much sun exposure. Monitoring these symptoms can help determine if adjustments to sunlight exposure are needed to maintain the plant's health.

What strategies can be used to optimize sunlight exposure for Yellowwood?

To ensure Yellowwood receives adequate sunlight, gradually acclimate it to brighter conditions by moving it closer to sunlight each week until it gets at least 6 hours of direct sunlight daily. For indoor plants, consider relocating them to south-facing windows or using artificial light sources such as desk lamps or grow lights for at least 8 hours a day. Outdoors, avoid sudden changes in light intensity to prevent sunburn by gradually moving plants to sunnier spots. To improve light access, remove physical obstructions and consider transplanting smaller plants to sunnier locations during their dormant periods, ensuring they're planted in areas with good drainage and ample sunlight.

🌡️ Temperature 5–35°C

The yellowwood is a temperate woody plant that prefers temperatures between 41 and 95 ℉ (5 to 35 ℃). It is native to regions with a continental climate marked by hot summers and cold winters. In winter it can tolerate lows down to -22 ℉ (-30 ℃), but it needs protection from freezing winds. In summer it can endure highs up to 104 ℉ (40 ℃) if it receives adequate moisture. Therefore, it is best planted where it will get some shade during the hottest part of the day in summer.

Ideal temperature: 5–35°C
FAQ
What is the ideal temperature range for Yellowwood?

The yellowwood thrives in a temperate climate and prefers a temperature range of 41 to 95°F (5 to 35°C). It is well-adapted to a continental climate characterized by hot summers and cold winters. The plant can endure winter lows down to -22°F (-30°C) with adequate protection from freezing winds, while in summer, it can withstand highs up to 104°F (40°C), provided it has sufficient moisture. To prevent stress during peak summer heat, positioning the yellowwood in partial shade is beneficial.

How does Yellowwood handle extremely cold temperatures?

Yellowwood has a strong resistance against cold and generally does not require special frost protection measures. However, in regions where temperatures might fall below -30°C (-22°F), it's crucial to provide some form of cold protection. Wrapping the trunk and branches with non-woven fabric or cloth can offer sufficient protection. Additionally, it's recommended to water the plant abundantly before the first freeze of autumn to ensure the soil remains moist, which helps prevent drought and water scarcity during the colder months.

What are the signs of cold and heat stress in Yellowwood, and how can they be addressed?

Signs of cold stress in yellowwood become evident when temperatures fall below -30°C (-22°F), leading to brittle and dry branches in spring, with no new shoots emerging. Pruning dead branches can help the plant recover. In terms of heat stress, temperatures above 38°C (100°F) may cause the leaves to lighten in color, tips to dry and wither, and increase susceptibility to sunburn. Trimming sunburned parts, relocating the plant to a shaded area, or using a shade cloth, along with watering in the morning and evening, are effective solutions to mitigate heat stress.

What is the botanical name of the Yellowwood?

The botanical name of the Yellowwood is Cladrastis kentukea. It's a plant native to regions with a continental climate, boasting a capacity to tolerate a broad range of temperatures and climatic conditions.

💨 Humidity
Humidity:
🪴 Soil 5-7
Soil pH: 5-7
🌱 Fertilizer

Fertilize your Yellowwood in early spring to encourage healthy growth. Regular feeding boosts its overall health, producing vigorous growth, increased tolerance of harsh conditions, and better resistance to pests and diseases. Follow a consistent fertilization schedule for your Yellowwood to keep foliage vibrant, deeply colored, and lush in appearance.

FAQ
Why should I put fertilizer on my Yellowwood plant?

If you own any type of Yellowwood plant, regular fertilization can greatly benefit its overall health. By providing the proper nutrients, you can promote stronger growth and improve its ability to withstand harsh growing conditions and fend off diseases and pests. The foliage of your Yellowwood is particularly beautiful, so it is important to prioritize its preservation. To achieve this, establish and stick to a regular fertilization routine that is tailored to your specific Yellowwood plant. This will encourage vibrant leaves with rich color and a lush appearance.

When should I fertilize my Yellowwood tree?

During late winter or early spring, it's important to fertilize your Yellowwood for its healthy growth when the weather becomes warm. If you live in a warm climate, providing an additional fertilizer feeding in early fall is beneficial. This will give your Yellowwood extra nutrients for the next growing season and help it withstand the winter by preventing foliage damage. Fertilizing earlier will also give the new branches enough time to grow and be able to withstand the cold winter.

When is it not a good idea to put fertilizer on my Yellowwood?

There are specific times of the year when you should not fertilize your Yellowwood. The first time is during the early and mid-winter months when the tree is dormant and doesn't need any nutrients. It is also not recommended to fertilize the plant in late spring and summer. The hotter and drier weather during this time can have a negative impact on the tree if it is fertilized. To avoid any problems, it's best to stick to a fertilization schedule that only includes feeding in early spring and early fall.

What kind of fertilizer does my Yellowwood tree need?

Yellowwood trees generally require high amounts of nitrogen as a key nutrient, but this doesn't mean that phosphorus and potassium should be overlooked. In fact, all three nutrients are important for the tree's overall health. Using a balanced fertilizer like a 10-10-10 can be effective for providing these nutrients. However, it's worth noting that a more nuanced ratio of nutrients can promote optimal growth. In many cases, fertilizers with slightly higher nitrogen content, like a 10-6-4 ratio, tend to work well. Both granular and liquid-based fertilizers can be used for application.

How can I provide nutrients to my Yellowwood plant?

To fertilize your Yellowwood, you have two options: using a granular fertilizer or a liquid fertilizer. When using granular fertilizer, simply sprinkle it on the soil at the appropriate time. The slow-release nature of this fertilizer will gradually release nutrients into the soil. It is recommended to lightly water your Yellowwood before applying the granular fertilizer. As for liquid fertilizer, it is less commonly used. To apply it, mix the fertilizer with water and pour the mixture onto the soil around the base of your Yellowwood. Additionally, it may be beneficial to perform a soil test before fertilizing to determine if any pH adjustments are necessary.

🪴 Pot & Repot
✂️ Pruning

Yellowwood is known for its smooth, gray bark and fragrant white flowers, and it thrives when pruned in early spring. To care for this tree, it's important to remove dead wood, thin out crowded branches, and shape it for an open canopy. Pruning at the right time reduces sap loss, encourages growth, enhances flowering, and helps maintain the tree's overall health and structure.

🌿 Propagating
🐛 Diseases & pets
☠️ Toxicity

The yellowwood tree is considered toxic and should be kept out of the reach of persistent children or pets. The foliage contains hydrolyzable tannins and condensed tannins, harmful compounds that may result in liver and kidney damage when ingested in large amounts.

Characteristics

Plant Type
Tree
Life Cycle
Perennial
Genus
Cladrastis
Family
Fabaceae
Hardiness Zone
4-9
Mature Height
9.14 m to 13.72 m
Mature Spread
11.89 m to 14.94 m
Leaf Color
Green, Yellow
Leaf Type
Deciduous
Flower Color
White
Flower Size
2.54 cm
Bloom Time
Late spring, Early summer
Planting Time
Spring, Autumn
Harvest Time
Mid summer

Tags (22)

Common Names (6)

en Kentucky Yellowwood
en Yellowwood
en Kentucky Yellow-wood
en American Yellow-wood
en Virgilia
en American yellowwood