White Robe Cup Flower

White Robe cupflower is a low, spreading Nierembergia selection covered with white flowers through summer. Its compact habit makes it useful for sunny containers, rock gardens, edging and small-scale groundcover where a fine-textured flowering plant is wanted. ## Flowers and form Kaw Valley Greenhouses identifies the selection as Nierembergia caerulea 'White Robe' and describes compact plants with blooms throughout summer. Its profile lists white to ivory flowers, a spreading habit, heat tolerance, and an approximate mature size of 6–12 inches tall by 8–12 inches wide. It is treated as an annual and listed as not hardy. Nierembergia taxonomy varies among sources; the White Robe selection name is retained. ## Siting and care Plant in full sun to part sun. Use a freely draining site or container mix and water when the soil begins to dry; avoid prolonged saturation. The spreading form can soften the edge of a sunny bed or rock garden, and its flowers show well in pots near a path or seating area. ## Maintenance Water regularly while plants establish and during hot, dry weather. Trim back uneven growth if needed to maintain a neat edge, and remove damaged stems. [Kaw Valley Greenhouses' White Robe profile](https://www.kawvalleygreenhouses.com/plants/Detail/2056) supports the selection identity, form, flowers, size and siting; [Wisconsin Horticulture's genus profile](https://hort.extension.wisc.edu/articles/nierembergia/) describes variation in Nierembergia naming and taxonomy.