What Conditions Are Needed for Growing Blueberries? A Detailed Guide to the Latest Growing Requirements

Blueberry, also known as blue plum, dusi, dushi, etc., is a perennial shrub of the genus Vaccinium in the family Ericaceae. It is named for its blue fruit and is rich in nutrients, containing not only conventional nutrients but also extremely abundant flavonoids and polysaccharide compounds, giving it very high cultivation value and market prospects. Let us take a look below at what conditions are needed for growing blueberries!

Growing Conditions for Blueberries

1. Climate: Based on China's climatic characteristics and the growth habits of different blueberry cultivar groups, the growing regions can be roughly divided into four production areas: the Changbai Mountain and Greater and Lesser Khingan Mountains blueberry production area, the Liaodong Peninsula and Jiaodong Peninsula blueberry production area, the Yangtze River Basin blueberry production area, and the South China blueberry production area.

2. Soil: Blueberries are suited to loose, well-drained sandy loam soil, with a soil pH of 4.0 to 5.5, the most suitable soil pH being 4.3 to 4.8, a soil organic matter content of 8 to 12%, and the optimal soil water table at 40 to 60 cm, with the soil moist but not waterlogged.

3. Water: Blueberry roots are relatively shallow and quite sensitive to lack of water. In most cases, timely irrigation is needed based on soil moisture conditions. River water, reservoir water or groundwater can all be used as irrigation water sources, but avoid choosing water sources with high salt content and high pH for irrigation.

4. Terrain: For blueberries, it is best to choose relatively gentle flat land or gentle slopes. Although steep mountain land is beneficial for improving fruit quality, it brings a lot of inconvenience to field operations. Avoid choosing valley land or low-lying plots for growing blueberries, so as to avoid frost damage during the flowering period.

Cultivated Varieties of Blueberry

1. Highbush blueberry: Highbush blueberries have relatively large fruit, excellent quality and a good fresh-eating taste. They can be grown as varieties for the fresh fruit market, or for processing or home garden use. They include two main categories: southern highbush blueberry and northern highbush blueberry.

(1) Southern highbush: Southern highbush blueberries prefer humid, warm climatic conditions and are suitable for development in areas south of the Yellow River in China, such as Central China and South China. Excellent varieties include Sharpblue, O'Neal, Misty, etc.

(2) Northern highbush: Northern highbush blueberries prefer cool climates and have relatively strong cold resistance. Some varieties can withstand low temperatures of -30°C and are suitable for development in humid coastal areas of northern China and cold regions. Excellent varieties include Coville, Darrow, Bluecrop, etc.

2. Half-high blueberry: Half-high blueberry plants are relatively shorter, with large fruit, excellent quality and strong cold resistance, usually able to withstand low temperatures of -35°C. They are suitable for cultivation in cold northern regions. Excellent varieties include Northland, Northblue, Northcountry, etc.

3. Lowbush blueberry: Lowbush blueberry plants are short and have extremely strong cold resistance, able to be cultivated in low-temperature regions of -40°C. Cultivation and management are also relatively simple, making them suitable for large-scale commercial cultivation in the high-cold mountainous areas of Northeast China. Excellent varieties include Blomidon, Fundy, etc.

4. Rabbiteye blueberry: Rabbiteye blueberry plants are tall, long-lived and resistant to heat and humidity. They are not strict about soil requirements and are drought-resistant, but they have poor cold resistance. They are suitable for cultivation in hilly areas south of the Yangtze River Basin in China, South China and other regions. Excellent varieties include Baldwin, Gardenblue, Powderblue, etc.

Growing Methods for Blueberries

1. Deep plowing and land preparation: After the blueberry site is selected, deep plowing should be carried out 1 year before planting together with green manure incorporation, with a depth of 20 to 25 cm being appropriate, so as to deepen and mature the soil. For soil types that do not meet blueberry requirements, soil improvement should be carried out before planting to benefit organic blueberry growth.

2. Planting time: In the south, where winters are not very dry, planting from autumn to before early spring bud break is best. In places with dry autumn and winter, planting when the rainy season arrives is appropriate. In places with irrigation conditions, planting can be done in all four seasons, and in Majiang, Guizhou, planting can also be done in summer.

3. Planting density: The planting depth for one-year-old seedlings is 15 to 20 cm, and the soil must be firmed up and pressed tight, achieving “three lifts and two presses with one seedling lift”. Rabbiteye blueberry often uses 2×2 m or 1.5×3 m, highbush blueberry 1.2×2 m, and lowbush blueberry (0.5 to 1)×1 m.

3. Pollinator trees: Rabbiteye blueberry must be provided with pollinator trees. Highbush blueberry and lowbush blueberry have relatively high self-fruitfulness, but providing pollinator trees can also improve fruit quality and yield. The arrangement method uses a 1:1 or 1:2 ratio of the main cultivar to the pollinator cultivar.

4. Soil management: Blueberry roots are relatively shallow and fine, without root hairs, so the soil is required to be loose and well aerated.

(1) Clean cultivation: Clean cultivation can be carried out from early spring to August. After autumn begins, clean cultivation is unfavorable for overwintering. Highbush blueberries grown on sandy loam soil commonly use clean cultivation, with a cultivation depth of 5 to 10 cm being appropriate; too deep can easily damage the roots.

(2) Sod culture: That is, growing grass between the rows. Compared with clean cultivation, sod culture is similarly beneficial for increasing yield and also has the advantages of maintaining soil moisture and facilitating mechanical operations.

(3) Mulching: Soil mulching is widely used in blueberry production and has multiple effects, including increasing soil organic matter, improving soil structure, regulating and maintaining soil moisture, lowering soil pH, and controlling weeds.

5. Fertilization methods: When fertilizing blueberries, it is recommended to use organic fertilizer. China's farmland has already suffered serious pollution due to excessive use of chemical fertilizers, ultimately leading to reduced yields or even total crop failure.

(1) Fertilizer types: Applying nitrogen-phosphorus-potassium compound fertilizer gives better results than applying a single fertilizer. The ratio of nitrogen, phosphorus and potassium fertilizers should preferably be 1:1:1. Ammonium-form nitrogen fertilizers such as ammonium sulfate are preferable; nitrate nitrogen fertilizers should not be applied, and chlorine-containing fertilizers such as ammonium chloride and potassium chloride should not be chosen.

(2) Fertilization method: Highbush and rabbiteye blueberries can use the furrow application method, with a depth of 10 to 15 cm being appropriate. Fertilization is carried out before early spring bud break, and it can also be applied once more during the berry ripening stage.

(3) Fertilization amount: Excessive fertilization can very easily harm blueberry plants or even kill the entire plant, so determining the fertilization amount must be done very carefully and must be based on soil fertility and the nutritional status of the plants.

6. Irrigation methods: Blueberry roots are shallow and prefer moisture, so timely irrigation is very necessary, but attention must be paid to the water source and water quality. Deep well water generally has a relatively high pH and high sodium and calcium content, so sulfuric acid can be used to adjust the pH to around 4.5 to 5.5 before irrigation.

7. Disease control: Diseases affecting blueberries include fungal diseases, bacterial diseases and nematodes, etc., but since China is a newly introduced cultivation area, the occurrence of pests and diseases is relatively low, and routine preventive work is sufficient.

8. Timely harvest: Rabbiteye and southern highbush blueberry fruits do not ripen uniformly. Harvesting generally needs to continue for 20 to 30 days, usually once a week. For fresh consumption, the fruit should be picked by hand; for processing, mechanical harvesting can be used.