Illustration
Blue Zinger Sedge
Carex flacca 'Blue Zinger'
Also called glaucous sedge 'blue zinger'
Blue Zinger Sedge blooms from July through August.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Blue Zinger Sedge
Plant it in part shade. It prefers moderate water. It is hardy in USDA zones 5–9. Expect it to reach about 16 in tall and 20 in wide at maturity, in roughly 3 years (a house reading).
No toxicity note is on file for Blue Zinger Sedge. That is not a clearance: check its safety for people and pets before planting.
What was checked
Mature height and spread, hardiness zones, sun, water, bloom months and color and the trait tags were checked against named botanical sources for this plant, with what the sources could not settle written down; years to mature size rests on a recorded house rule where no publisher states one, and is marked so; its common name and alternate names have not been checked yet. Each fact above carries its own mark. The planting, spacing and size sections are derived from these checked facts by a fixed rule, not checked separately, and the plant type is the library's own classification.
When to plant Blue Zinger Sedge
Plant Blue Zinger Sedge in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 7, the middle of its hardy zones 5 to 9, spring means March to May and fall means September or October. Once settled, it blooms from July to August.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 7, the middle of this plant's hardy range, start with zone 7 in March. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Blue Zinger Sedge get?
16 intall5 ft 7 inan adult20 inwideSee Blue Zinger Sedge in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant Blue Zinger Sedge
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Blue Zinger Sedge about 20 in apart, center to center, so each plant has room to reach its full width.
Add Blue Zinger Sedge to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Where these facts come from
Blue Zinger Sedge's height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 9 published sources on September 23, 2026. Each one is linked below with every fact it carried, which can include a fact this page still marks as not yet checked, because a source carrying a value is not the same as the value being held to the standard. Facts not in that list, and the planting, spacing and size sections, are not covered by these sources.
- Missouri Botanical GardenPlant Finderheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases and pests
- RHSRoyal Horticultural Societyheight, spread, sun, water, bloom months and color, trait tags, soil, diseases and pests
- kiefernursery.comKiefer Nurseryheight, spread, hardiness zones, sun, water, bloom months and color and soil
- Plant Delights Nurseryheight, spread, hardiness zones, sun, bloom months and color, soil and pests
- smgrowers.comSan Marcos Growers (archived wholesale grower page)height, spread, hardiness zones, sun, water, bloom months and color and pests
- Chicago Botanic GardenPlant Finderhardiness zones, sun, water, bloom months and color, trait tags and pests
- gardendesign.comGarden Design magazine (Sedge: A Growing Guide for Carex)sun, soil, diseases, pests and toxicity
- ecgrowers.comEmerald Coast Growers (the introducer; wholesale liner page)height, hardiness zones, sun and trait tags
- Missouri Botanical Gardenthe SPECIES entry, Carex flaccasun, water and bloom months and color
How the checking works, and what each standard covers, is on the verified plants page.
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