Lingonberry

Vaccinium vitis-idaea ‘Red Pearl,’ a specific cultivar of lingonberries. Lingonberries are indeed known for their tart flavor and are versatile in various culinary applications, such as jams, juices, and sauces. The plant’s characteristics, as you mentioned, make it well-suited for rockeries, tubs, and window boxes due to its compact size and evergreen nature.
Here’s a summary of the information you provided:
Botanical Name: Vaccinium vitis-idaea ‘Red Pearl’
Common Names: Lingonberries, cowberries, mountain cranberries
Characteristics:
Juicy tart red berries
Rich in vitamins
Evergreen plants
Maximum height: 15-20cm (6-8 inches)
Plant spacing: 30cm (12 inches)
Well-suited for rockeries, tubs, and window boxes
Heavier cropping than cranberries
Extremely hardy and resistant to pests and diseases
Fruits typically ripen in two flushes late July and late September
This information provides a good overview of the key features and benefits of growing Vaccinium vitis-idaea ‘Red Pearl.’