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"Posen" is a new variety of blackberry, known for its strong adaptability, early maturity, and excellent flavor. It was introduced from the United States by the Institute of Botany, Chinese Academy of Sciences. The variety received official certification from the Jiangsu Provincial Department of Agriculture and Forestry in December 2006 and is now being widely promoted in Nanjing.
This thorny shrub has a sprawling growth habit with numerous small thorns, making it less upright. Its leaves are alternate, and both the petioles and veins bear thorns. The flowers are bisexual, white in color, and self-pollinating. After fruiting, the flowers fall off easily along with their pedicels.
The ripe berries are purplish-red and oblong, with an average weight of about 5.99 grams, making it a large-fruited variety. The flavor is sweet, slightly tart, refreshing, and aromatic. The soluble solids content ranges from 8.50% to 11.50%, while the soluble sugar content is around 6.35%. It is suitable for fresh consumption or processing.
For optimal quality, the fully ripe fruits should be consumed or processed immediately after harvest. At room temperature, eight mature fruits can be stored for up to 2-3 days. This variety is early maturing, prefers slightly acidic soils, is drought-tolerant, and can withstand low temperatures down to -15°C. However, the ripening period on the same cluster is uneven, so harvesting should be done in stages and batches to ensure the best quality.