Crocosmia is a perennial grown for its orange blooms, which open in summer and return year after year. It's hardy across USDA zones 6 through 9, shrugs off deer and grows just as well in a container as in the ground. Its summer flowers are a moderate draw for hummingbirds and native bees.
Crocosmia — the short answer
Crocosmia: grown in zones 6–9, full sun, pH 6–7.
- USDA zones
- 6–9
- Manual horticultural correction (source not retained); NC State Extension and Missouri Botanical Garden, with the remaining rows from other published sources or Growable Ground compilation
- Soil pH
- 6–7
- Growable Ground Plant Database
- Sun
- Full Sun
- Growable Ground Plant Database
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — each tile names its own row's source, because per-field provenance varies.
Score Crocosmia on your exact land.
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What Crocosmia is
Crocosmia grows as a perennial and reaches around 2.5 feet at maturity. It blooms orange in summer. It's also deer-resistant and well suited to containers.
How to grow Crocosmia
Crocosmia grows in USDA zones 6 through 9. Crocosmia does best in full sun — at least 6 hours of direct sun a day — and soil from pH 6 to 7, on well-drained ground.
USDA Zones
6-9
USDA PHZM 2023
Soil pH
6 - 7
Growable Ground Plant Database
Sun
Full Sun
Growable Ground plant catalog
Drainage
well (dry spells)
Growable Ground plant catalog
Mature Height
2.5 ft
Growable Ground plant catalog
Start the season right
Plant crocosmia in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Crocosmia prefers pH 6 to 7 (Growable Ground Plant Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water steadily
Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at its peak
Cut crocosmia blooms in the cool of the morning, just as they open, for the longest display.
Where Crocosmia thrives
Crocosmia is hardy across USDA zones 6 through 9. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.
A USDA zone is a 10°F band of average annual extreme winter minimum, so zones 6–9 spans average winter lows from -10°F to 30°F (USDA PHZM 2023). Across the 50 states and DC, that band covers 14 outright and splits 34 more down the middle — and which side of that line your land sits on changes the answer.
Zones 6–9·Where Crocosmia growsOpen map →
This map is derived from the USDA ARS / PRISM Plant Hardiness Zone Map (2023) and is not the official USDA Plant Hardiness Zone Map.
Where Crocosmia stands, state by state
Crocosmia is rated for zones 6–9 — a cold floor USDA puts at -10 to 0°F. Across the 50 states and DC, 14 sit fully inside that band, the line runs through 34 more, and 3 sit outside it — and inside every split state, the same line runs on at county grain.
Fully inside zones 6–9
14 states
- Arkansas · zones 6b-8b
- Connecticut · zones 6a-7b
- Kentucky · zones 6a-7b
3 of 14 shown
The line runs through
34 states
3 of 34 shown
Crocosmia’s band covers part of each of these states — which side of the line your county sits on changes the answer, and each state page draws it.
Outside zones 6–9
3 states
- Minnesota · zones 3a-5a
- North Dakota · zones 3b-4b
- South Dakota · zones 4a-5b
Winter cold is the limit here — the same plant often works in a container that comes under cover. Each link is that state’s own growing hub.
State zone extents: USDA Plant Hardiness Zone Map (PHZM) 2023. A zone is a 10°F band of average annual extreme minimum temperature, so a state that splits the band contains the boundary — its own page draws the county line, and a parcel report resolves which side your land sits on.
What grows around Crocosmia
Growing guides for crocosmia
In rotation planning, crocosmia counts as a Other — beds recover best when other crops don’t follow each other in the same spot year over year. (Growable Ground derivation — crop-rotation group from botanical family)
Related plants in perennial flower
Good to know
One caution for pet owners — crocosmia is toxic to dogs and cats (mild severity). Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: ASPCA.)
Crocosmia offers moderate value to bees and other pollinators. (Source: Pollinator Partnership.)
Your land is one point inside Crocosmia's range
This page resolves to the species. Your state page draws the county line, and a report reads the parcel — the soil pH, drainage, sun, and frost dates on your exact ground, which no species average can see.
See if Crocosmia will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether crocosmia actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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How we know this about Crocosmia
The figures above are cited per row, not per site: the pH band names this plant’s own source column, the three temperature figures each carry their own, and days-to-maturity cites the publication that actually lists it. All of it comes from the Growable Ground Plant Database — a compilation over FAO ECOCROP, USDA PLANTS, and university Extension sources, published openly with per-field provenance.
Grounded inUSDA PLANTS Database•USDA PHZM•ASPCA
Frequently asked questions
Can I grow Crocosmia in my zone?
Crocosmia grows in USDA hardiness zones 6 through 9 (USDA PHZM 2023). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
When should you plant Crocosmia?
Most growers plant crocosmia after the last spring frost, once the soil has warmed. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Crocosmia need?
Crocosmia needs full sun — a spot that catches at least 6 hours of direct summer sun a day. In more shade it still grows, but usually gives a smaller, later crop. The catch is that a yard rarely gets even light everywhere — a fence, the house, or one tall tree can quietly take those hours. A Growable Ground report reads the real sun-hours across your land, canopy and buildings included, so you can pick the brightest bed before you plant.
What soil does Crocosmia need?
Crocosmia prefers soil pH 6 to 7, on well-drained ground (Growable Ground Plant Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Crocosmia attract pollinators?
Yes — crocosmia's flowers are a solid nectar source for hummingbirds and native bees. (Source: Pollinator Partnership.)
Is Crocosmia safe for pets?
Crocosmia is toxic to pets (dogs,cats) with mild severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: ASPCA.)
Keep exploring Crocosmia
Crocosmia state by state
Every state crocosmia's zone reaches — 5 link straight to that state's crocosmia growing page; the rest open the state's full growing guide.