Hellebore is grown for its blooms, which open in summer. It's hardy across USDA zones 4 through 9 and shrugs off deer. Its summer flowers are a moderate draw for native bees.
Hellebore — the short answer
Hellebore: grown in zones 4–9, part sun, pH 6.5–8.
- USDA zones
- 4–9
- NC State Extension Gardener Plant Toolbox
- Soil pH
- 6.5–8
- We haven't confirmed this against a published source yet.
- Sun
- Part Sun
- We haven't confirmed this against a published source yet.
- Frost-kill temp (growing season)
- 32°F
- We haven't confirmed this against a published source yet.
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 Hellebore on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether hellebore actually takes — and those shift from one yard to the next. Enter your address and we'll score hellebore against your land's real conditions.
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What Hellebore is
Hellebore reaches around a foot and a half at maturity. It blooms in summer. It's also deer-resistant.
Mature height and bloom period: We haven't confirmed this against a published source yet.
How to grow Hellebore
Hellebore grows in USDA zones 4 through 9. Hellebore does best in part sun — at least 4 hours of direct sun a day — and soil from pH 6.5 to 8, on well-drained ground.
USDA Zones
4-9
NC State Extension Gardener Plant Toolbox
Soil pH
6.5 - 8
We haven't confirmed this against a published source yet.
Sun
Part Sun
We haven't confirmed this against a published source yet.
Drainage
well (dry spells)
We haven't confirmed this against a published source yet.
Frost Kill Temperature
32°F
Where cold starts killing growing tissue. Not a winter-survival floor — a dormant perennial takes far colder, which its hardiness zone answers.
We haven't confirmed this against a published source yet.
Minimum Growing Temperature
50°F
Below this it stops growing rather than dies — a pace limit, not a survival limit.
We haven't confirmed this against a published source yet.
Mature Height
1.5 ft
We haven't confirmed this against a published source yet.
Start the season right
Plant hellebore in part sun with at least 4 hours of direct sun, once the soil has warmed and frost risk has passed. We haven't confirmed this against a published source yet.
Match the soil
Hellebore prefers pH 6.5 to 8. We haven't confirmed this against a published source yet. 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. We haven't confirmed this against a published source yet. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at its peak
Cut hellebore blooms in the cool of the morning, just as they open, for the longest display.
Where Hellebore thrives
Hellebore is hardy across USDA zones 4 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 4–9 spans average winter lows from -30°F to 30°F (USDA PHZM 2023). Across the 50 states and DC, that band covers 33 outright and splits 18 more down the middle — and which side of that line your land sits on changes the answer.
Zones 4–9·Where Hellebore 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 Hellebore stands, state by state
Hellebore is rated for zones 4–9 — a cold floor USDA puts at -30 to -20°F. Across the 50 states and DC, 33 sit fully inside that band, the line runs through 18 more, and 0 sit outside it — and inside every split state, the same line runs on at county grain.
Fully inside zones 4–9
33 states
3 of 33 shown
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 Hellebore
Growing guides for hellebore
Related plants in perennial flower
Good to know
One caution for pet owners — hellebore is toxic to dogs and cats (moderate severity). Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: NC State Extension Gardener Plant Toolbox.)
Hellebore offers moderate value to bees and other pollinators. We haven't confirmed this against a published source yet.
Your land is one point inside Hellebore'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 Hellebore will thrive on your land
Zone averages are a start. Your soil pH, drainage, sun exposure, and frost dates shape whether hellebore actually takes. We score it against the mapped and modelled 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.
25+ data sources analyzed in seconds
How we know this about Hellebore
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
Frequently asked questions
Can I grow Hellebore in my zone?
Hellebore grows in USDA hardiness zones 4 through 9 (NC State Extension Gardener Plant Toolbox). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
When should you plant Hellebore?
Most growers plant hellebore 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 Hellebore need?
Hellebore does well in partial sun — around 4 hours of direct sun, and it takes some afternoon shade in stride. We haven't confirmed this against a published source yet. That flexibility makes it a good match for a bed the house or a nearby tree shades for part of the day. A Growable Ground report maps how the sun actually falls on your land, hour by hour, so you can set it where the light lines up.
What soil does Hellebore need?
Hellebore prefers soil pH 6.5 to 8, on well-drained ground. We haven't confirmed this against a published source yet. Your report scores your parcel's mapped soil against that using USDA SSURGO data.
Does Hellebore attract pollinators?
Yes — hellebore's flowers are a solid nectar source for native bees. We haven't confirmed this against a published source yet.
Is Hellebore safe for pets?
Hellebore is toxic to dogs and cats with moderate severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: NC State Extension Gardener Plant Toolbox.)
Keep exploring Hellebore
Hellebore state by state
Every state hellebore's zone reaches — 27 link straight to that state's hellebore growing page; the rest open the state's full growing guide.