Purple Robe Cup Flower

Purple Robe cupflower forms a compact mound of fine foliage covered in lavender-blue, cup-shaped blooms with yellow throats. This named Nierembergia selection flowers from late spring through summer and suits sunny beds, borders, containers and hanging baskets. ## Flowers and form The flowers are about 2 inches across, and the plants are described as uniform, floriferous and long-blooming. Ball Seed identifies the selection as Nierembergia caerulea; taxonomic treatments of Nierembergia vary, so the catalog's existing named selection is retained. Plants are about 8 inches tall and 8–10 inches wide in Ball's production profile. ## Siting and care Grow in sun. Ball Seed lists light watering and monthly fertilizing for production, and describes good garden vigor in beds and baskets. In garden use, provide ordinary drainage and water during establishment and extended dry spells; avoid keeping the root zone persistently wet. The compact mound works near paths, along a sunny border edge, or where its flowers can spill over a container rim. ## Maintenance Remove spent or damaged growth as needed to keep the mound tidy. Provide water while new plants establish, then adjust to local rainfall and heat. [Ball Seed's Purple Robe plant profile](https://info.ballseed.com/WEBTRACKPLANTINFO.ASPX?PHID=044501264004341&env=P) supplies the selection description, growing habit and production guidance; [Wisconsin Horticulture's Nierembergia profile](https://hort.extension.wisc.edu/articles/nierembergia/) discusses the genus and its variable taxonomy.