Salix viminalis
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Salix viminalis

Basket Willow · Osier · Common osier · Hemp willow · Koripaju

Tier 1 Difficulty: easy Water: low Light: full_sun
Temperature
5–32 °C
Soil pH
5–7
Hardiness
Zone 4–8
Click count
788
Observations
1,649

Description

Source: leafsnap

Salix viminalis, the basket willow, common osier or osier, is a species of willow native to Europe, Western Asia, and the Himalayas.

🌳 The basket willow is a plant traditionally valued for making baskets because of its long, flexible shoots. However, its usefulness reaches well beyond that craft. Recent studies have identified its potential as a bioenergy crop. It grows rapidly and can be harvested yearly, making it a strong candidate for biomass production. It also shows high tolerance to heavy metals, enabling phytoremediation — the use of plants to remove pollutants from the soil. Ongoing work is investigating its applications in producing biofuels and bioplastics, positioning the basket willow as a renewable resource for a range of green industries.

Care Guide

💧 Water

Basket willow thrives in moist environments, requiring high soil moisture for lush growth. Water the basket willow every three weeks, and adjust for dry spells if it's grown outdoors, to maintain hydration levels similar to its natural habitat near water sources.

FAQ
What's the most effective way to water my Basket willow plant?

To promote excellent root development, consider placing a garden hose at the base of the plant. Avoid spraying the leaves directly, as this may require more watering if the plant is outside and exposed to direct sunlight. Moistening the roots can be done by using bubblers for individual plants or soaker hoses that cover the entire garden or bed. After adding or removing plants, it is important to allow excess water to drain and wait for the soil to dry before watering. Watering at ground level helps prevent diseases. On a sunny day, it may be beneficial to spray the entire bush with water. Regardless of whether the plant is in a pot or in the ground, keep in mind that Basket willow prefers deep watering rather than light sprinkling.

What should I do if I give the Basket willow plant too much or too little water?

An overwatered Basket willow displays several signs of stress. These include yellowing, dropping, and wilting of leaves, along with a dull and unhealthy appearance and mushy stems. It's important to adjust your watering schedule when these signs start to appear. However, wilting can also be a sign of underwatering. In this case, the leaves will become crispy and dry. When the soil is dry and a normal watering is inadequate, give the plant a thorough watering. This will help the Basket willow recover, although it may still have dry and yellow leaves due to damage to the root system. Once the plant returns to normal, the yellowing of leaves will cease. If you have a Basket willow indoors, always check the moisture levels in the pot and avoid overwatering. Look for signs of black spots, and if present, allow the soil to dry out for a few days before watering again. Overwatering can lead to root rot, so it's important to prevent this by not letting the soil become overly soggy. When planting the Basket willow outdoors, ensure that you dig deeper and check the moisture level of the soil. If it is too dry, it may indicate underwatering, and proper watering is necessary for the plant to recover.

How often should I water my Basket willow plant?

The Basket willow prefers deep and infrequent watering, especially when planted in pots. When they are in pots, the water storage is limited and the soil dries out faster, so it's important to soak them in a gallon of water each time. In cold regions, watering is required every 3 to 5 days. Water the plant early in the morning when the soil is dry, whether it's indoors or outdoors. You can also check the soil inside by feeling the top 2-3 inches. If it's dry, it's time to give the plant a full watering. During hot days, check the moisture daily as the soil can dry out quickly in pots. If you have a garden, irrigation of the soil is necessary. In hot climates, water once a week when about 2-3 inches of soil becomes too dry. Consider the amount of rainfall and avoid adding water if there's already enough to prevent root rot. Basket willows usually grow in spring and fall. Add mulch about 3 to 4 inches deep when they are outdoors to conserve water. Sandy soil drains faster, so water more frequently. Conversely, with clay soil, you can wait 2-3 days for the plant to dry out and avoid root rot. Keep track of watering dates on a calendar and watch for drooping leaves as an indicator of when to water.

How much water should I give my Basket willow?

The Basket willow generally needs about a gallon of water on a regular basis. For potted plants, water them deeply until you see water dripping from the bottom of the pot, then wait for the soil to dry before watering again. You can use a water calculator or moisture meter to track the amount of water you give your plant in a week. During the flowering period, provide plenty of water but let the moisture evaporate afterwards to prevent root rot. If the Basket willow is planted outdoors and receives adequate rainfall, additional watering may not be necessary. However, when the Basket willow is young or newly planted, make sure it gets 1-2 inches of rain per week. As the Basket willow grows, it can rely solely on rainfall. Only in hot weather or when there is no rainfall for 2-3 weeks, consider watering the Basket willow fully during cooler moments of the day to prevent heat damage. Additional watering will be required during persistent dry spells.

Do I need to water my Basket willow more or less depending on the time of year or the weather?

The Basket willow needs to be outdoors and relies on rain for watering, but if there is persistent dry weather, you may need to water it. In the spring and fall, the soil should be kept moist but not soggy, alternating between dry and moist conditions is beneficial for growth. During the hot summer months, water can evaporate quickly, so if there is a lack of rainfall, more frequent watering is necessary to keep the plant moist. Generally, the Basket willow requires less water during winter when it goes dormant. You can use a well-draining soil mixture like terracotta to help water evaporate faster. Once the Basket willow starts growing and the leaves come out, you can stop watering and rely on fall and winter rains to sustain it during the dormant period. In the spring, encourage growth and blooming by cultivating the plant when temperatures increase. Good drainage is crucial for the Basket willow, especially in winter. If the plant is in a pot, its root growth is limited, so keep it well-watered, especially in the summer. Avoid cold and wet roots by providing adequate drainage. It is recommended to water the Basket willow thoroughly, ensuring the entire root system gets soaked at least once or twice a week, depending on the weather. Shallow sprinkles should be avoided as they encourage fungi growth and do not reach the roots effectively. Even during dormancy in the fall or winter, do not let the plant dry out completely. Overwatering should also be avoided to prevent the plant from sitting in water for too long, as this can be detrimental during winter. Applying mulch whenever possible can help reduce stress, conserve water, and promote healthy blooming.

☀️ Light Full sun

Basket willow prefers a location where it gets direct sunlight for most of the day, but it can also tolerate spots with moderate light. Native to sunny regions, it requires ample light for optimal health and growth. Not enough light can slow its development, while too much light can damage the plant or cause it to dry out.

Ideal: Full sun
FAQ
What are the sunlight requirements for Basket willow?

Basket willow thrives best in full sun, requiring above 6 hours of sunlight daily, but it can also adapt to partial sun, with about 3-6 hours of sunlight. It's crucial to observe the movement of sunlight through your garden to find the ideal balance of light and shade, ensuring your plants are both happy and healthy. Originating from sun-rich regions, Basket willow needs ample lighting for optimal growth. Insufficient light can inhibit growth, while excessive exposure can lead to damage.

What are the symptoms of inadequate light on Basket willow?

When Basket willow is exposed to insufficient light, it may exhibit symptoms such as smaller new leaves, leggy or sparse growth, faster leaf drop, slower or no new growth, and lighter-colored new leaves. In conditions of excessive sunlight, it may suffer from chlorosis (leaves turning yellow), sunscald, leaf curling, wilting, and leaf scorching. These symptoms indicate either a lack of adequate sunlight or damage caused by too much direct sun.

How can artificial lighting be used for Basket willow indoors?

In places where natural sunlight is insufficient, especially during winter or in less sunny locations, artificial lighting can provide a significant boost. For optimal growth, use LED lights as they can be tailored to deliver specific wavelengths needed by plants. Full sun plants require 30-50W/sq ft, partial sun plants 20-30W/sq ft, and full shade plants 10-20W/sq ft of artificial light. The lights should be placed 12-36 inches above the plant and left on for 8-12 hours per day to mimic natural sunlight conditions.

What are the solutions for Basket willow experiencing inadequate sunlight?

To address inadequate sunlight for Basket willow indoors, gradually increase exposure to sunlight by moving the plant to a sunnier spot weekly, aim for at least 6 hours of direct sunlight daily through a south-facing window. If the plant is large, consider using artificial light for at least 8 hours daily. Outdoors, move your plants gradually to sunnier locations to avoid sunburn, and ensure new growth after adjusting light exposure is healthy. To maximize natural light for ground-planted Basket willow, reduce obstructions by pruning nearby trees or transplant smaller plants to sunnier locations with good drainage during their dormant period.

🌡️ Temperature 5–32.2°C

Basket willow originates from temperate areas and does best in conditions where temperatures range from 41 to 90°F (5 to 32℃). As the seasons change, make slight temperature adjustments to replicate its natural habitat.

Ideal temperature: 5–32.2°C
FAQ
What are the ideal temperature conditions for growing Basket Willow?

Basket Willow, known botanically as Salix viminalis, flourishes in temperate regions, with optimal growth observed within a temperature range of 41 to 90°F (5 to 32°C). To best replicate its natural habitat, slight adjustments in temperature with the changing seasons are beneficial. Notably, Basket Willow possesses strong cold resistance, typically negating the need for frost protection measures. However, in scenarios where winter temperatures plummet below -30°C, implementing cold protection by wrapping the trunk and branches with insulative materials like non-woven fabric or cloth is advisable. Additionally, it is recommended to water the plant abundantly before the first freeze of autumn to ensure the soil remains moist and enters a state of freeze, which aids in preventing drought and water scarcity throughout the winter and early spring months.

How does Basket Willow react to extremely low temperatures, and what measures should be taken?

Despite Basket Willow's noteworthy tolerance to cold, maintaining temperatures above -25°C during winter is crucial for its longevity and health. Exposure to temperatures below -30°C may not immediately manifest in visible damage during the winter months; however, such conditions can lead to brittle and dry branches come spring, with a notable absence of new shoots. To mitigate these effects, the recommended course of action is to prune any dead branches that have failed to produce new leaves in the spring, thereby stimulating healthier growth patterns and preserving the vibrancy of the plant.

What are the effects of high temperatures on Basket Willow, and how can they be alleviated?

In the summer, it is important to ensure that the Basket Willow's environment remains below 32°C to prevent heat stress. Temperatures exceeding 35°C can cause the leaves to lighten in color, and the tips may become dry and withered, increasing the plant's susceptibility to sunburn. To protect the plant under these conditions, it is advisable to trim away the sunburned and dried sections, relocate the plant to a shaded area, or use a shade cloth to shield it from the midday and afternoon sun. Additionally, watering the plant in the morning and evening will help maintain soil moisture and contribute to the plant's overall health during periods of excessive heat.

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

The timing of fertilizing Basket willow is critical. Begin in early spring and apply monthly up to early summer. Fertilizer encourages attractive blooms and gives the plant energy during both dormant and active growth stages.

FAQ
Why do I have to put fertilizer on my Basket willow plant?

Fertilizing a Basket willow is important for multiple reasons. One obvious reason is that it helps the tree produce beautiful blooms. Fertilizing in early spring is particularly effective in ensuring excellent flowers during that season. Additionally, fertilizer provides the tree with ample energy that it can store in the ground during periods of dormancy. Giving the tree extra nutrients during fall planting or in late spring will help it store more energy to use once active growth resumes.

When should I fertilize my Basket willow?

When fertilizing Basket willow, timing is crucial to ensure effectiveness and prevent waste and pollution. Avoid using fertilizer too early when the Basket willow is still dormant, as it will be washed away by rainwater. Instead, apply the first round of fertilizer in early spring and continue fertilizing once a month until early summer.

When is the best time to not fertilize my Basket willow?

To ensure healthy growth and blooming of Basket willow, it is important to take proper care when fertilizing. First and foremost, be cautious of using fertilizers with excessive nitrogen content as this can result in an abundance of leaves but fewer blooms. Instead, opt for a fertilizer with a lower nitrogen level compared to other nutrients. Timing is also crucial. Avoid fertilizing after early autumn, as this can cause excessive growth right before winter, which might not be beneficial. Additionally, refrain from fertilizing Basket willow during hot and dry periods, as dry soil does not effectively deliver nutrients. Fertilizing during this time can promote growth that requires more water, potentially causing water scarcity issues. It is advisable to apply fertilizer earlier in the season when temperatures are cooler. Lastly, keep in mind that Basket willow has the ability to absorb fertilizer from nearby plants or lawns. Therefore, be mindful of inadvertently providing the tree/shrub with double the intended dose of fertilizer.

What kind of fertilizer does my Basket willow plant need?

To best nourish a Basket willow, it is recommended to use a fertilizer that provides a balanced mix of the three main nutrients, with slightly higher amounts of phosphorus. Alternatively, you can enrich the soil by adding organic materials like compost, worm castings, and manure. Experienced gardeners often supplement their plants with water-soluble fertilizers containing phosphorus when flower buds start to appear. This can enhance flower development, resulting in larger blooms that last longer. There are various forms of fertilizers available, but liquid or powdered options are particularly beneficial for Basket willows. Regardless of the form you choose, make sure to dilute the fertilizer and apply it while watering your Basket willow.

How should I fertilize my Basket willow plant?

To use fertilizer effectively for your Basket willow, it's important to follow specific directions and conduct some research. Avoid over-fertilizing the tree by determining the appropriate amount to use. A good guideline is to calculate one-tenth of a pound of fertilizer per year or per inch of trunk, with a maximum of one pound. Granular and organic fertilizers should be applied by sprinkling them around the base of the tree, extending all the way to the drip line. Be careful not to let the fertilizer touch the trunk. Over time, the granules will break down and seep into the soil, where the roots can absorb them. After fertilizing, spread a one-inch layer of compost around the base of the tree and water thoroughly.

🪴 Pot & Repot
✂️ Pruning

Basket willow is known for its long, flexible shoots, making it ideal for weaving. To maintain its quality and promote healthy growth, it is important to prune the plant in early spring. Begin by removing any damaged stems and trimming back vigorous growth to encourage bushiness. Additionally, cutting away older wood will help foster new stems, enhancing the overall quality of the material. Consistent pruning ensures that the willow produces strong, flexible shoots, which are essential for maintaining optimal health and productivity.

🌿 Propagating
🐛 Diseases & pets
☠️ Toxicity

Characteristics

Plant Type
Tree
Life Cycle
Perennial
Genus
Salix
Family
Salicaceae
Hardiness Zone
4-8
Mature Height
7.01 m
Mature Spread
5.49 m
Leaf Color
Green
Leaf Type
Deciduous
Flower Color
Yellow
Flower Size
3.05 cm to 6.35 cm
Bloom Time
Spring
Planting Time
Spring, Autumn
Harvest Time
Late spring, Early summer, Mid summer

Tags (7)

Common Names (11)

en Basket Willow
en Osier
en Common osier
en Hemp willow
en Koripaju
en Common Osier Willow
en Silky osier
en Osier willow
en Twiggy willow
en French osier
en Basket Osier