Blueberries are temperate-to-subtropical plants that require a specific number of winter “chill hours” (temperatures between 0°C and 7°C) to break dormancy and set fruit. They prefer moderate summer temperatures, as extreme heat above 32°C can cause fruit shriveling and heat stress. While the bushes are relatively cold-hardy, a late spring frost is a major risk, as it can kill the blossoms and eliminate the season’s yield.

These plants favor moderate to high relative humidity, generally between 60% and 80%, which helps maintain the hydration of their thin-skinned fruit. However, high humidity combined with poor air circulation increases the risk of fungal diseases like mummy berry and fruit rot. Proper spacing and pruning are essential in humid environments to ensure the foliage dries quickly after rain or dew.

The ideal soil is a highly porous, sandy loam with a high organic matter content (at least 3% to 5%) to support the plant’s powerful and deep root system. Despite being vigorous, blueberry roots are very sensitive to compaction and waterlogging; they require soil that is consistently moist but exceptionally well-drained to prevent root rot and allow for constant oxygen exchange.

Blueberries have the most rigid pH requirement of any major fruit crop, thriving only in highly acidic soil between 4.5 and 5.2. If the pH rises above 5.5, the plant undergoes severe physiological stress, often resulting in yellowing leaves and a complete failure to grow. Maintaining this acidic environment is necessary for the plant to stay healthy and produce a marketable harvest.