Weeping Willow

Fertilizing

Use a balanced organic fertilizer with potash, phosphoric acid, and nitrogen during spring and autumn growing seasons. Avoid fertilizing during summer months and the first six weeks after repotting. For best results, apply slow-release organic fertilizer specifically designed for bonsai trees to provide steady nourishment. Chemical fertilizers should be avoided as they can damage the delicate root system. The fertilizer schedule is particularly important for Weeping Willows due to their rapid growth rate.

While strong, balanced nutrition is essential, fertilizing should be avoided when the tree shows signs of stress or poor health. This species has high nutrient demands during active growth periods but requires careful monitoring to avoid over-fertilization which can lead to root burn.

Placement

Keep the Weeping Willow bonsai outdoors in a location that receives full sun to partial shade. During hot summers, some afternoon shade protection is beneficial to prevent leaf scorch. The tree should receive at least 6 hours of direct sunlight daily for optimal growth, but avoid placing it in areas with intense afternoon sun that could damage the delicate foliage.

If growing indoors temporarily, place near a south-facing window or under grow lights, though outdoor placement is strongly preferred for long-term health. Regular rotation of the tree helps ensure even growth and prevent leaning. While hardy in USDA zones 4-8, this species performs best with consistent light exposure and good air circulation.

Pruning

Prune regularly throughout the growing season, as Weeping Willows can grow up to 12 inches per month. Focus on pinching new growth rather than heavy pruning, as this encourages better branching and helps maintain the desired shape. Remove dead, damaged, or crossing branches to maintain an aesthetic form and promote air circulation. Keep the natural cascading growth pattern while controlling size through selective pruning.

The tree responds well to pinching of new shoots, which is preferable to hard pruning. Regular maintenance pruning helps develop dense foliage and maintains the classic weeping form. When shaping, consider the natural downward flow of branches while ensuring adequate space between branches for light penetration and air movement. Pay special attention to maintaining the desired silhouette without over-thinning the canopy.

Repotting

Repot young Weeping Willow bonsai twice yearly, in early spring and early summer, due to their vigorous growth rate. When repotting, trim approximately half of the roots to stimulate new growth and prevent root binding. Use a well-draining bonsai soil mix with good moisture retention capabilities, ideally containing components like akadama and pumice for optimal drainage and aeration.

Choose a pot with multiple drainage holes that's deep enough to accommodate the extensive root system. The pot should be wide enough to provide stability for the cascading growth habit. Older specimens may need less frequent repotting, but careful attention should be paid to signs of root crowding. After repotting, place the tree in a sheltered location and maintain consistent moisture levels while it reestablishes.

Watering

Water abundantly to maintain consistently moist but not waterlogged soil. Check moisture levels daily by inserting a finger about an inch into the soil - water thoroughly when the surface feels slightly dry. Never allow the soil to completely dry out between waterings, as Weeping Willows are water-loving trees that require high moisture levels to thrive.

To maintain proper humidity, regularly mist the foliage, especially during warm or dry periods. Ensure excellent drainage to prevent root rot, and never let the pot sit in standing water. During hot summer months, you may need to water multiple times daily. Monitor water needs closely and adjust based on climate conditions, pot size, and the tree's growth rate.

References

Care Bonsai - Weeping Willow Care Guide Bonsai Tree Gardener - Weeping Willow Guide Bonsai Mary - Weeping Willow Care