Weeping cherry trees are ornamental deciduous trees known for their graceful, cascading branches and abundant spring blossoms. Often called Prunus subhirtella or Prunus pendula, these trees originated in Japan and are valued for their distinctive form and seasonal beauty. As autumn approaches, understanding their specific needs is important for long-term health and continued appeal. Proper care during this transitional period helps ensure they remain robust and vibrant.
Weeping Cherry Autumn Changes
As fall progresses, weeping cherry trees transform. Their glossy green leaves shift into hues of yellow and orange. This color change prepares the tree for dormancy, a period of reduced metabolic activity during colder months.
Autumn colors result from the breakdown of chlorophyll, the green pigment responsible for photosynthesis. As chlorophyll diminishes, other pigments like carotenoids (yellows and oranges) become visible. Eventually, leaves will senesce and drop, leaving the tree bare through winter. This shedding allows the tree to conserve energy and moisture, protecting it from freezing temperatures.
Fall Care Practices
Appropriate fall care is important for the health of your weeping cherry tree. Adequate watering is necessary, especially if dry conditions persist. Apply water slowly and deeply, ensuring the soil around the root ball is consistently moist but not waterlogged to prevent root rot.
Apply a 2- to 4-inch layer of organic mulch around the tree’s base to retain soil moisture and regulate soil temperature. Keep the mulch several inches away from the trunk to prevent moisture buildup and potential pest or disease issues. Fertilizing weeping cherry trees in the fall is not recommended, as it can stimulate new growth vulnerable to early frosts.
Cleanup of fallen leaves around the tree’s base is beneficial. This helps remove any fungal spores or pests that might overwinter in the debris. Raking and disposing of infected leaves can reduce the risk of recurring disease in the following season.
Winter Preparation
Beyond general fall care, specific steps prepare your weeping cherry for winter. Ensuring the tree is adequately hydrated before the ground freezes is important, especially for newly planted trees. This deep watering prevents winter desiccation when moisture becomes unavailable due to frozen soil.
Protecting the trunk from sunscald and rodent damage is beneficial, particularly for young trees. Sunscald, caused by fluctuating winter temperatures, can be mitigated by wrapping the lower trunk with tree wrap. Tree wraps or hardware cloth can deter rodents such as mice and voles from gnawing on the bark.
Dormant pruning, if needed, is best performed in late fall after leaf drop or in late winter/early spring before new growth begins. This timing minimizes stress and allows for clear visibility of its structure. Avoid heavy pruning in early fall, as it can encourage new, tender growth susceptible to frost damage.
Addressing Fall Issues
Weeping cherry trees can exhibit issues in the fall that warrant attention. Fungal spots, such as cherry leaf spot, may become more apparent on leaves as they prepare to drop. These spots often appear as purple, black, or brown discolorations, sometimes leading to a “shot-hole” appearance. Raking and disposing of affected leaves can reduce overwintering fungal spores.
Signs of pest activity, like borers or aphids, might be observed. Borers can cause damage to the trunk, while aphids can lead to distorted or yellowing leaves. Early detection and appropriate management, such as using insecticidal soap for aphids, can prevent more severe infestations.
Premature leaf drop, outside of the normal senescence process, can indicate tree stress. This may be due to drought stress, especially during dry autumns, or underlying disease. Wilting, curling, or yellowing leaves often signal insufficient watering or drainage problems, or conditions like cherry shot hole disease.