Blue Zinger Sedge Grass

Carex flacca ‘Blue Zinger’ is a slowly spreading sedge selected for its fine blue to glaucous foliage. It forms a low clump that can gradually knit into groundcover, with small dark flower spikes appearing among the leaves in late spring. The exact introducer lists an 18 inch mature height and USDA zones 4–9; other references give different sizes. ## Form and placement The exact-selection [RHS profile](https://www.rhs.org.uk/plants/285760/carex-flacca-blue-zinger/details) describes a robust clump about 30 cm tall, intense blue foliage, late-spring purplish-black flower spikes, and gradual spreading. [Emerald Coast Growers, the selection’s introducer](https://ecgrowers.com/carex-glauca-blue-zinger-38/) describes steel-blue clumps, full sun to part shade, an 18 inch mature height, and zones 4–9. [Stonehouse Nursery](https://stonehousenursery.com/plant/carex-flacca-blue-zinger/) gives a smaller 8–12 inch height and 12–24 inch spread, illustrating the variation among published estimates. The display range uses that spread while numeric width stays unset because no single point is supported. ## Growing conditions RHS lists full sun or partial shade and clay, loam, sand, or chalk, with soil moisture from well-drained to moist. Its profile calls the plant drought resistant, but does not specify established-plant conditions, so choose irrigation according to site drainage. The blue foliage works as a low edging or groundcover accent; allow room for gradual spread. ## Maintenance Remove worn foliage in spring if needed to expose new growth. Check the clump’s spread periodically and divide only when it outgrows its space.