The timing selection for mulching and covering soil on blueberry plants is very important. Generally, there are the following key periods:

I. Late autumn

1. Time range
- Usually from late October to mid-November, when the temperature gradually drops and blueberry plants enter the early stage of dormancy.
2. Reasons
- Cold protection and warmth preservation: As the temperature drops in late autumn, mulching and covering soil on blueberry plants can play a very good role in cold protection and warmth preservation. It can prevent freezing damage to blueberry roots and above-ground parts caused by low winter temperatures and protect the plants to overwinter safely.
- Maintaining soil moisture: In winter, mulching can reduce soil moisture evaporation and maintain soil moisture, providing good soil moisture conditions for blueberry growth in the coming year.

II. Early spring

1. Time range
- Approximately from late February to mid-March, after the soil thaws and before blueberry plants sprout.
2. Reasons
- Temperature regulation: In early spring, the temperature is unstable and there is often a late spring cold spell. Mulching and covering soil can increase soil temperature, enabling blueberry plant roots to grow in a relatively warm environment and promoting early sprouting of plants.
- Frost damage prevention: It can effectively prevent the damage to new shoots of blueberry plants caused by early spring frosts and ensure the normal growth and yield of blueberries.

When performing mulching and covering soil operations during these two periods, attention should be paid to operation methods and follow-up management. For example, when mulching and covering soil in autumn, make sure to fully prune the blueberry plants before performing the operation; when operating in spring, pay attention to observing temperature changes and plant growth conditions, and timely perform management such as uncovering the film and ventilation to avoid excessive temperature inside the film affecting plant growth.

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