Unlikely — Zone Mismatch
lemon verbena (zones 8-11) does not overlap with Connecticut's zone range (6a-7b). Growing outdoors is unlikely without significant protection.
One zone short — what would close it
Lemon Verbena is hardy to zone 8, and the warmest ground in Connecticut is zone 7 — 1 zone short. Planted in open ground it will not survive a Connecticut winter. To grow it here, grow lemon verbena in a container and move it under cover for the coldest weeks, or give it a greenhouse.
Season extension and overwintering under cover both work at this margin. How to buy the weeks →
Zone math from 8-11 (plant) against 5-7 (Connecticut). Lift modeled by crop_engine Sprint 20B effective_zone_modifier (+2 zones) via api/fast_sections.py Unlock Engine v2.
Your yard isn't the whole zone.
Connecticut spans zones 6a-7b, but your yard sits in exactly one — and slope, tree cover, and cold-air pockets nudge it further. Enter your address and we'll score lemon verbena against your parcel's actual hardiness, soil, and sun.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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Zone Comparison
Lemon Verbena Needs
- USDA Zones: 8-11
- Frost-Free Days: 365+
- Sun: Full Sun
- Mature size: 6 ft tall
- Picking window: ~120 days of harvest
- Drought tolerance: Medium
Connecticut Has
- USDA Zones: 6a-7b
- Last Hard Freeze (28°F): Mar 31 - Apr 11
- First Hard Freeze (28°F): Oct 30 - Nov 3
- Annual Rainfall: 44-52 inches
- Common Soils: Glacial till, Sandy loam, River valley silt
Plant Zone Range (zones 8-11)
Preferred Soil pH
Plant data: USDA PLANTS Database / Growable Ground plant catalog. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Lemon Verbena in Connecticut
The frost window
Across Connecticut, the last spring hard freeze (28°F) clears between Mar 31 and Apr 11, and the first fall hard freeze lands between Oct 30 and Nov 3 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 202-day window you can count on — up to 217 days on a mild site in a kind year. That marks the hard freeze, not the last light frost, so tender transplants usually wait another 2-3 weeks.
When to start the seed
Those dates are when lemon verbena goes out, not when it starts. It is sown under cover about 10 weeks ahead, so counting back from Connecticut's late-side last freeze of Apr 11 is what fixes your sowing date — and a yard that clears frost earlier than the state's late date starts earlier still.
Winter standing
Connecticut runs as cold as USDA zone 6, and no sourced winter-hardiness floor is on record for lemon verbena, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether lemon verbena is a permanent planting or a replant-every-spring crop for you turns on your own zone within Connecticut; check its hardiness range against that before treating it as long-lived ground.
Timing tuned to sub-state frost dates — Northwest Hills County, not the statewide average.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: USDA PLANTS Database. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
The zone check says lemon verbena does not survive a Connecticut winter in the ground. The season figures below measure a different question — whether it could finish a season here at all — and they only bear on Connecticut under protection.
Frost-free days
Lemon Verbena wants 365+ frost-free days; a typical Connecticut site sees ~207 (NOAA Regional Climate Centers ACIS, 1991-2020) — 158 days short of what it needs. A typical Connecticut season does not carry this crop to harvest outdoors, and a gap that size is not one an earlier sowing date or a faster cultivar closes; growing it here means growing it under cover.
Growing degree days
Lemon Verbena needs ~2000 GDD (base 50°F) to ripen. The state median runs ~2664 GDD (from PRISM 1991-2020 climate normals), so Connecticut's typical season clears that easily.
GDD and chill-hour figures are computed from PRISM 1991-2020 monthly climate normals; frost-free days from NOAA Regional Climate Centers ACIS, 1991-2020. Each is the state median across its counties (P25/P75 span the within-state spread). Hardiness-zone range is USDA PHZM 2023.
Soil + Drainage Fit
Lemon Verbena likes near-neutral soil (pH 5-7.5). That's the common-ground band across Connecticut's glacial till and sandy loam — a soil test confirms it for your site. It will grow across that whole span, but it does best between pH 5.5 and 7 — worth knowing before you decide whether a Connecticut soil test result is a problem or just a number. Drainage matters: this plant wants well (dry spells). If your Connecticut site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Your land, not the state average
County soil mapping is limited for Connecticut, so a direct soil test on your own parcel — pH, texture, and drainage — is the real answer for whether lemon verbena will thrive there.
Check your parcel → Source: USDA NRCS SSURGO (county summary limited).
Plant pH and drainage requirements from USDA PLANTS Database. Connecticut soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Lemon Verbena in Connecticut — Quick Answer
- Verdict: Unlikely — Zone Mismatch
- Plant Zones: 8-11 (USDA PLANTS Database)
- State Zones: 6a-7b (USDA ARS PHZM 2023)
- Growing Season: 28°F hard freezes about Mar 31 - Apr 11 to Oct 30 - Nov 3 (NOAA Regional Climate Centers ACIS, 1991-2020)
- Days to Maturity: 120 days
What Else to Consider for Lemon Verbena in Connecticut
Zone compatibility tells you about winter cold survival — but Connecticut growers also need to think about:
Rocky glacial soils require clearing and amendment
Short growing season in northern hills
Deer pressure is high in suburban areas
What to actually do about these — and the constraints that apply to every Connecticut grower, not just lemon verbena — is covered on the Connecticut growing guide.
Timing shifts within Connecticut
Connecticut isn't one climate. In Northwest Hills County, the last hard freeze (28°F) holds until about Apr 19 — roughly 12 days later than the recorded state median — so plant lemon verbena to your county's window, not the statewide date.
Lemon Verbena needs about 365 days of frost-free season to complete its cycle. No Connecticut county gives it that outdoors: even Greater Bridgeport County, the state’s longest season at 239 frost-free days, falls 126 days short — so it needs transplants, a short-season variety, or covered growing.
County last-freeze dates and frost-free day counts: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F freeze (earlier than the folk 32°F "last frost"). Lemon Verbena's 365-day requirement: USDA PLANTS / Growable Ground plant database (minimum frost-free days). A parcel report resolves your address's own frost dates.
Pollinator + Wildlife Value
Lemon Verbena draws honeybees, native bees, and butterflies (moderate value, Growable Ground Plant Database). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, lemon verbena can only work that bloom inside Connecticut's frost window — roughly 207 days, opening after the last 28°F freeze (Mar 31 - Apr 11) and closing at the first (Oct 30 - Nov 3), per NOAA Regional Climate Centers ACIS, 1991-2020.
Recommended Lemon Verbena Varieties for Connecticut
Connecticut publishes no state variety trial for lemon verbena, so we won't invent a "best for Connecticut" list. Choose types rated to your USDA hardiness zone (6a-7b), and confirm winter survival and drainage against your own parcel.
Connecticut Cooperative Extension
For Connecticut-specific cultivar recommendations, planting calendars, and pest pressure for lemon verbena, the canonical source is UConn Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Lemon Verbena native to Connecticut?
No — the USDA PLANTS Database lists Lemon Verbena as introduced rather than native in the Lower 48, so it is not part of Connecticut's native flora. It grows here as a garden plant; pairing it with a few Connecticut natives keeps local pollinators fed too.
Looking for plants that belong here? The Connecticut growing guide lists USDA-documented natives for the state.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Lemon Verbena in Connecticut
When can I plant Lemon Verbena in Connecticut?
Connecticut's last spring hard freeze (28°F) clears between Mar 31 and Apr 11, and the first fall hard freeze lands between Oct 30 and Nov 3 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Lemon Verbena, so this page does not state whether it overwinters in Connecticut and publishes no fall establishment date for it — check its hardiness range against your own zone before treating it as a permanent planting.
What hardiness zone is Lemon Verbena grown in across Connecticut?
Connecticut spans USDA hardiness zones 6a-7b (USDA ARS PHZM 2023). Lemon Verbena carries a range of zones 8-11, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Connecticut site have?
A typical Connecticut site sees ~207 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Lemon Verbena needs 365+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date. In cooler counties like Northwest Hills, the freeze-free season runs shorter than the state average, so verify your own county's window.
Is Lemon Verbena native to Connecticut?
No — the USDA PLANTS Database lists Lemon Verbena as introduced rather than native in the Lower 48, so it is not part of Connecticut's native flora. It grows here as a garden plant; pairing it with a few Connecticut natives keeps local pollinators fed too.
How should I amend the soil for Lemon Verbena in Connecticut?
Lemon Verbena prefers pH 5-7.5 and well (dry spells) drainage (FAO ECOCROP). That sits in the common-ground band across Connecticut soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Lemon Verbena actually grow on my specific land in Connecticut?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores lemon verbena against your address's exact soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in Connecticut
State-level data is a sketch. Your Growable Ground report scores lemon verbena against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that Connecticut lemon verbena averages can't show:
We read public map data around Connecticut — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Connecticut lemon verbena average
Explore More
Growing guides for lemon verbena
Analysis by the Growable Ground research team, grounded in USDA PLANTS, USDA NRCS SSURGO, NOAA Climate Normals (1991-2020), and named Cooperative Extension sources. How we know →
Cite this dataset
Kirchick, M. (2026). Growable Ground Plant Database [Data set]. Zenodo. https://doi.org/10.5281/zenodo.21435643
Licensed CC BY-NC 4.0. DOI 10.5281/zenodo.21435643
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