Causes and Solutions for Yellowing Leaves on Pearl Plum Bonsai

Before the buds open, the pearl plum's shape resembles pearls, each one plump like a pearl grain; after blooming, the small white flowers look like snow. Because the buds are white and bright as pearls, and the petals and stamens resemble plum blossoms, it was named pearl plum (Sorbaria sorbifolia). The pearl plum is shaped like a jewel and resembles the snow plum in spirit. It grows luxuriantly, with full clumps, clean and elegant branches and leaves, green leaves and white flowers; its value lies in producing elegant white flowers in the flower-scarce height of summer, and its flowering period is very long. In particular, it has a killing or inhibiting effect on many harmful bacteria, making it suitable for planting in all kinds of garden green spaces.

Pearl plum, also known as pearl spirea, belongs to the genus Spiraea in the rose family. It is a deciduous shrub with abundant branches and leaves, umbel inflorescences, and dense small white flowers that profusely resemble accumulated snow. The flowering period is April to May, and it is suitable for clump planting, group planting, and mass planting. When grown as a home bonsai for viewing, the pretty beauty of its blooming flowers is even more refreshing and delightful. What causes the leaves of the pearl plum to turn yellow and the leaf tips to wither?

1. Usually, overly wet watering causes part of the root system to rot. When there is too much water and moisture, new leaves are prone to turning yellow and dying. When watering, water after the potting soil has dried; do not water when it is damp. Watering after it dries is beneficial to the growth of new branches and new leaves.

2. Too low indoor humidity also easily causes new leaves to turn yellow and dry. This is especially true in winter in air-conditioned rooms or heated rooms where humidity is low. You can place a few basins of water around it to increase humidity, or open doors and windows at intervals to lower the room temperature and increase indoor air circulation, which can increase indoor humidity and reduce the symptoms of new leaves turning yellow and drying out caused by low humidity.

3. Nutrient deficiency disorders, such as iron deficiency, can also cause chlorosis in new leaves, with leaves turning yellow and dry. You can bury compound fertilizer and mineral additives around the edge of the pot according to the recommended amount to supplement the pot's nutrient deficiencies and reduce the symptoms of yellowing and death caused by nutrient problems.

For a potted pearl plum bought from the market, because it does not have high soil requirements, it is very easy to keep alive. You only need to do the following three things:

1. Water promptly during spring droughts. During summer and autumn droughts, water thoroughly to keep the soil from becoming dry; before winter arrives, water once more with antifreeze water.

2. It has low fertilizer requirements. When newly transplanted, apply enough base fertilizer and it can meet its growth requirements, generally without additional topdressing. Later, in combination with winter management, apply base fertilizer once every 1-2 years.

3. After flowering, promptly prune away remaining flower branches, diseased and pest-infested branches, and old and weak branches to keep the plant shape neat, avoid nutrient consumption, and promote robust growth with abundant flowers and leaves.

Notes on cultivating pearl plum:

1. Pearl plum has strong adaptability and low fertilizer requirements. Aside from newly planted plants needing a small amount of base fertilizer, no further fertilizer is needed afterward, but watering is needed. Generally, water thoroughly 2-3 times from bud break to the flowering period, and water 2-3 times from the beginning of autumn to before frost.

2. During the bud stage, spray Huaduo Zhuangdiling to promote strong buds, plump petals, vivid flower color, and rich fragrance.