Although little-known and generally hard to find, the cup flower is a diminutive joy in the garden. Neat, spreading mounds of the fine-textured foliage are smothered with blue-violet purple or blossoms all summer long. Blossoms hold their colour without fading even in the brightest sun.
It behaves well as an edging to a edge or walk, and can be planted in window boxes, hanging baskets, and pots. It’s also a logical substitute for trailing lobelia where the latter dies out in the heat.
For its easy care, long-season blue violet shade, and limited size, the cup bloom deserves greater popularity.
It needs rich, sandy, moist, well-drained soil that’s high in organic matter, and light shade to full sun. Shade is preferred in areas with hot summers. Keep the plants moist, but be careful to not overwater.