Picrasma quassioides — an easy houseplant, prefers full sun light
SPECIMEN · FROM THE LIBRARY
Picrasma quassioides

Picrasma Quassioides

Updated · 4 observations
ON THIS PLANT

Picrasma quassioides (picrasma; Chinese: 苦樹 ku shu, Japanese: ニガキ nigaki "bitterwood"; also India quassia, quassia wood, shurni, quassia-wood, or quassiawood; syn. P. ailanthioides) is a species of Picrasma native to temperate regions of southern Asia, from the northeast of Pakistan east along the Himalaya and through southern, central and eastern China to Taiwan and Japan.It is a deciduous shrub or small tree growing to 10–15 m (rarely 20 m) tall with a trunk up to 50 cm diameter. The bark is smooth and dark grey-brown. The leaves are 15–40 cm long, pinnate, with 7–15 leaflets 2.5–10 cm long and 1.5–4.5 cm broad, with a coarsely and irregularly toothed margin. The flowers are green to yellow-green with four or five sepals and petals, produced in cymes 8–15 cm long in mid to late spring. The fruit is an ovoid to globose red to black drupe 6–7 mm diameter.

A note from PlantMom

Nigaki shows strong resistance to disease and is generally not susceptible to illnesses. Regarding care, this plant is fairly low-maintenance. When grown outdoors it needs minimal watering, and larger specimens typically do not require pruning. However, smaller plants should be pruned after they have finished blooming. Nigakit is suitable for anyone with outdoor space, like a garden or deck, and does not require extensive experience in plant care.

— PlantMom
CARE GUIDE

How to keep Picrasma Quassioides.

Light

Nigaki needs plenty of sunlight to grow and develop healthily. Locations that get consistent sun are best for it. However, it can adjust to spots with less light, showing some flexibility in its sunlight needs. Both too much and too little sunlight can endanger its health and growth.

Water

Nigaki is best suited for conditions similar to its natural habitat, requiring watering only once every three weeks. It is highly drought-tolerant and prefers its soil to dry out between waterings, so overwatering can be harmful. Nigaki is ideal for outdoor cultivation, and its water requirements decrease during dormancy in the cooler months when there is less light and lower temperatures.

Temperature

Nigaki is native to climates with temperatures ranging from 41 to 95 °F (5–35 ℃). It does well in these conditions, preferring a temperate range. To maintain optimal growth year-round, adjustments may be required during temperature extremes.

Fertilizer

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

Pruning

Nigaki has small, serrated leaves and provides medicinal benefits. It's best to prune it in early spring by removing dead branches and thinning out dense areas to improve air circulation. Be careful not to over-prune, as this can cause stress to the plant. Regular light pruning encourages bushier growth and enhances the plant's overall health, so follow reputable horticultural guidelines for best results.

CHARACTERISTICS

Botanical profile.

Plant Type
Tree, Shrub
Life Cycle
Perennial
Genus
Picrasma
Family
Simaroubaceae
Hardiness Zone
5-9
Mature Height
10.06 m to 14.94 m
Mature Spread
7.01 m
Leaf Color
Yellow, Orange, Green, Red, Gold
Leaf Type
Deciduous
Flower Color
Green, Yellow
Flower Size
7.62 cm to 15.24 cm
Bloom Time
Mid spring, Late spring
Planting Time
Spring, Autumn
Harvest Time
Late summer, Early fall, Mid fall
Native Area
Nepal, India, Myanmar, Japan, Koppen, Bhutan, South Korea, China
ALSO KNOWN AS

Other names.

en Bitterwood en Nigaki en Shurni
FREQUENTLY ASKED

Reader questions.

What's the best way to water my Nigaki plant?

Here are some tips to help you water your plants effectively and promote their root development: 1. Place a garden hose at the base of the plant for optimal root growth. Avoid spraying water directly on the leaves. 2. If your plants are outdoors and exposed to direct sunlight, the leaves may need more watering. Keep this in mind while watering them. 3. Consider using bubblers or soaker hoses to moisten the roots of each plant. Soaker hoses can also be used to cover the entire garden or bed when adding or removing plants, ensuring deep root penetration. 4. After watering, make sure to drain any excess water and wait for the soil to dry before watering again. 5. Water your plants at ground level to prevent the spread of diseases. 6. On a sunny day, it's beneficial to spray the entire bush with water. 7. Whether your plants are in pots or in the ground, remember that Nigaki (a specific type of plant) prefers deep watering rather than light sprinkling.

Why should I put fertilizer on my Nigaki plant?

No matter which type of Nigaki plant you have, regular fertilization is crucial for its overall health. By providing the right nutrients, your Nigaki can grow stronger, withstand harsh conditions, and have better defenses against diseases and pests. It's important to maintain the attractive foliage of your Nigaki, so stick to a regular fertilization schedule tailored to your specific plant. This will result in vibrant leaves and an overall lush appearance.

How much sunlight should Nigaki get each day to grow healthy?

To promote healthy growth, it is necessary for Nigaki to receive at least 3-6 hours of sunlight daily. This is actually the minimum amount required, as most plants that tolerate partial sunlight can also thrive in full sunlight. However, these plants are more adaptable because they need less light for photosynthesis compared to plants that specifically require full sunlight or partial shade.

What is the best temperature for Nigaki?

The optimal temperature range for Nigaki to thrive is between 65~80℉(18~27℃). During the primary growing phase, the highest tolerable temperature is 95℉(35℃), while the lowest tolerable temperature is 15℉(-10℃). This species can tolerate low temperatures and survive freezing winters. For reference, the ideal, highest, and lowest temperature ranges are as follows: Perfect: 65~80℉(18~27℃), Highest: 85~95℉(30~35℃), Lowest: -5~15℉(-20~-10℃) or below.

What should I do if I give Nigaki too much or too little water?

An overwatered Nigaki may exhibit yellowing, dropping, and wilting leaves, as well as a dull and unhealthy appearance with mushy stems. Adjusting your watering schedule is advised when these signs begin to appear. In contrast, wilting can also indicate under watering, with leaves becoming crispy and dry. If the soil is dry and regular watering is insufficient, provide a thorough watering. However, even with enough water, the plant may still display dryness and yellowing leaves for a few days due to the damaged root system. Once it returns to normal, the yellowing of leaves will cease. For indoor Nigaki, always check moisture levels and avoid overwatering. Look for signs of black spots, which suggest the need for drying out the soil for a few days. Overwatering can result in root rot, so transferring the plant to a different pot may be necessary if discolored and slimy roots are present. Preventing root rot by avoiding overly soggy soil is essential. When planting Nigaki outdoors, dig a little deeper and if the soil feels too dry, it may indicate underwatering, requiring adequate watering for recovery.

When should I fertilize my Nigaki tree?

The best time to fertilize your Nigaki is in late winter or early spring, as this gives the plant the necessary nutrients for healthy growth once the weather warms up. In warm climate regions, it can be helpful to provide an additional fertilizer feeding in early fall. This will add nutrients to the soil, which the Nigaki will use in the next growing season and also make it more resilient to cold winter temperatures. Fertilizing earlier will allow the new branches to grow enough to withstand the winter cold.

What kind of sunlight does Nigaki need?

Nigaki plants thrive in full or partial sun. While they prefer direct morning light, they should be protected from intense afternoon sun during the summer. In temperate environments, excessive hot afternoon sun can scorch the leaves, negatively impacting the plant's appearance and health.

Do I need to change the temperature for Nigaki at different stages of growth?

Research has shown that Nigaki plants tend to experience stunted growth when exposed to higher temperatures for long periods. This is particularly evident during the development of axillary buds and the growth of main shoots. To promote healthy growth after germination or transplanting, it is recommended to maintain a consistent and cooler temperature around 65℉ (18℃).

How frequently should I water my Nigaki?

The Nigaki plant prefers deep and infrequent watering, especially when planted in pots. In pots, the soil dries out faster, so soaking the plant in a gallon of water each time is recommended. In cold regions, water every 3 to 5 days, preferably in the morning when the soil is dry. Check the soil inside the pot to determine if watering is needed - if the top 2-3 inches of soil are dry, it's time for a full watering. On hot days, check the moisture daily as the heat quickly dries out the soil. If you have a garden, irrigation is necessary. In hot climates, water once a week when about 2 to 3 inches of soil are too dry. Take into account the rainfall to avoid overwatering and root rot. During spring and fall, Nigaki plants generally grow outdoors, so add about 3 to 4 inches of mulch to conserve water. Sandy soil drains faster, requiring more frequent watering, while clay soil needs less frequent watering to prevent root rot. Mark the watering dates on the calendar and look out for drooping leaves as a sign that watering may be needed soon.

When is the best time to not fertilize my Nigaki plant?

There are specific times of the year when you should avoid fertilizing your Nigaki plant. The first period is in the early and mid-winter months when the plant is dormant and does not require any feeding. It's also not advisable to fertilize during the late spring and summer, as these seasons tend to be hot and dry, which can have a negative impact on the plant if fertilized. To prevent any issues, it's best to stick to a fertilization schedule that involves feeding only in early spring and early fall.

Can the sun cause harm to Nigaki? How can I shield Nigaki from the sun and heat?

Moving potted Nigaki plants outdoors can result in damage from direct sunlight. To prevent sunburn, it is best to gradually move the pots from shade to areas with more light. However, even plants accustomed to the sun can be harmed by extreme heat. To help them cope with high temperatures, it is essential to keep the soil consistently moist. In cases of heatwaves, protecting sensitive Nigaki can be achieved by moving container plants to areas with afternoon shade or using a shade cloth.

How do I help Nigaki stay warm during cold seasons?

Nigaki plants can handle freezing temperatures when planted in the ground, as long as the temperature doesn't drop below 15℉ (-10℃). However, if you have them in pots or containers, make sure to protect their roots from the cold. You can do this by wrapping the container in a blanket or bringing it inside for complete protection.

PLATES
Picrasma quassioides leaf
PLATE 01 · leaf
Picrasma quassioides leaf
PLATE 02 · leaf
Picrasma quassioides flower
PLATE 03 · flower
Picrasma quassioides bark
PLATE 04 · bark
Picrasma quassioides bark
PLATE 05 · bark
Picrasma quassioides habit
PLATE 06 · habit
ALSO IN THE LIBRARY

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