Sweet Autumn Clematis is a climbing vine, a long-term addition to the landscape. It's hardy across USDA zones 5 through 9 and shrugs off deer. Its late summer flowers are a moderate draw for honeybees and native bees.
Sweet Autumn Clematis — the short answer
Sweet Autumn Clematis: grown in zones 5–9, full sun, pH 5.5–7.5.
- USDA zones
- 5–9
- Hardy to zone 5a — NC State Extension Gardener Plant Toolbox.
- Soil pH
- 5.5–7.5
- We haven't confirmed this against a published source yet.
- Sun
- Full Sun
- 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 Sweet Autumn Clematis on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether sweet autumn clematis actually takes — and those shift from one yard to the next. Enter your address and we'll score sweet autumn clematis against your land's real conditions.
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What Sweet Autumn Clematis is
Sweet Autumn Clematis grows as a perennial and reaches around 25 feet at maturity. It blooms white in late summer. It's also deer-resistant.
Mature height and bloom period: We haven't confirmed this against a published source yet.
How to grow Sweet Autumn Clematis
Sweet Autumn Clematis grows in USDA zones 5 through 9. Sweet Autumn Clematis does best in full sun — at least 6 hours of direct sun a day — and soil from pH 5.5 to 7.5, on well-drained ground. It needs around 2,000 growing degree days to mature, which is why climate matters as much as soil.
USDA Zones
5-9
Rated hardy to zone 5a by NC State Extension Gardener Plant Toolbox, checked Oct 2026. Ceiling: not verified.
Soil pH
5.5 - 7.5
We haven't confirmed this against a published source yet.
Sun
Full 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.
GDD Required
2000+
Growing degree-days of accumulated warmth it needs to mature — humid summers reach this faster than cool coastal ones.
We haven't confirmed this against a published source yet.
Mature Height
25 ft
We haven't confirmed this against a published source yet.
Start the season right
Plant sweet autumn clematis in full sun with at least 6 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
Sweet Autumn Clematis prefers pH 5.5 to 7.5. 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 sweet autumn clematis blooms in the cool of the morning, just as they open, for the longest display.
Where Sweet Autumn Clematis thrives
Sweet Autumn Clematis is hardy across USDA zones 5 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 5–9 spans average winter lows from -20°F to 30°F (USDA PHZM 2023). Across the 50 states and DC, that band covers 25 outright and splits 25 more down the middle — and which side of that line your land sits on changes the answer.
Zones 5–9·Where Sweet Autumn Clematis 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 Sweet Autumn Clematis stands, state by state
Sweet Autumn Clematis is rated for zones 5–9 — a cold floor USDA puts at -20 to -10°F. Across the 50 states and DC, 25 sit fully inside that band, the line runs through 25 more, and 1 sits outside it — and inside every split state, the same line runs on at county grain.
Fully inside zones 5–9
25 states
3 of 25 shown
The line runs through
25 states
3 of 25 shown
Sweet Autumn Clematis’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 5–9
1 state
- North Dakota · zones 3b-4b
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 Sweet Autumn Clematis
Growing guides for sweet autumn clematis
Good to know
One caution for pet owners — sweet autumn clematis 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: NC State Extension Gardener Plant Toolbox.)
Sweet Autumn Clematis offers moderate value to bees and other pollinators. We haven't confirmed this against a published source yet.
Your land is one point inside Sweet Autumn Clematis'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 Sweet Autumn Clematis will thrive on your land
Zone averages are a start. Your soil pH, drainage, sun exposure, and frost dates shape whether sweet autumn clematis 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 Sweet Autumn Clematis
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 Sweet Autumn Clematis in my zone?
Sweet Autumn Clematis grows in USDA hardiness zones 5 through 9 (Rated hardy to zone 5a by NC State Extension Gardener Plant Toolbox, checked Oct 2026. Ceiling: not verified.). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
When should you plant Sweet Autumn Clematis?
Most growers plant sweet autumn clematis 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 Sweet Autumn Clematis need?
Sweet Autumn Clematis needs full sun — a spot that catches at least 6 hours of direct summer sun a day. We haven't confirmed this against a published source yet. 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 Sweet Autumn Clematis need?
Sweet Autumn Clematis prefers soil pH 5.5 to 7.5, 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 Sweet Autumn Clematis attract pollinators?
Yes — sweet autumn clematis's flowers are a solid nectar source for honeybees and native bees. We haven't confirmed this against a published source yet.
Is Sweet Autumn Clematis safe for pets?
Sweet Autumn Clematis is toxic to dogs and cats with mild 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 Sweet Autumn Clematis
Sweet Autumn Clematis state by state
Every state sweet autumn clematis's zone reaches — 36 link straight to that state's sweet autumn clematis growing page; the rest open the state's full growing guide.