Yes — Strong Match
sweet alyssum is grown in zones 5-9, which covers every zone Arkansas contains (6b-8b). Whether the season is long enough is the question that remains.
Sweet Alyssum in Arkansas — the short answer
Sweet Alyssum in Arkansas: grown in zones 5–9, full sun, against a state median of ~254 frost-free days.
- Plant zones
- 5-9
- NC State Extension Gardener Plant Toolbox
- Arkansas zones
- 6b-8b
- USDA PHZM 2023
- Frost window
- Mar 2 - Mar 20 – Nov 15 - Nov 23
- NOAA RCC ACIS 1991-2020, 28°F
- Shortest county season
- 226 days
- NOAA Regional Climate Centers ACIS, 1991-2020, county 28°F killing freeze
- Days to maturity
- 55 days
- Growable Ground Plant Database
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — per-field provenance varies and is published with the dataset.
Your yard isn't the whole zone.
Arkansas spans zones 6b-8b, 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 sweet alyssum against your parcel's actual hardiness, soil, and sun.
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Arkansas is not one climate
A single Arkansas answer averages 75 counties whose growing seasons are 58 days apart — from 226 frost-free days in Benton County to 284 in Lincoln County. Which end of that your land sits nearer changes what sweet alyssum can finish before the first hard freeze.
The middle half of 75 counties runs 241–266 days, with a median of 254 days — a 58-day span end to end.
Measured across 75 Arkansas counties. NOAA Regional Climate Centers ACIS, 1991-2020, county 28°F killing freeze. Quartiles are order statistics — every figure shown is a value a real county recorded, not an interpolation. Your own site sits somewhere inside this range; a parcel report resolves where.
Where in Arkansas Fits Best
Even within Arkansas's zones 6b-8b, county microclimates differ enough to change what thrives. These counties carry the closest zone match for sweet alyssum (USDA PHZM 2023):
Zone Comparison
Sweet Alyssum Needs
- USDA Zones: 5-9
- Frost-Free Days: 40+
- Sun: Full Sun
- Mature size: 6 in tallWe haven't confirmed this against a published source yet.
- Picking window: ~90 days of harvestWe haven't confirmed this against a published source yet.
- Drought tolerance: MediumWe haven't confirmed this against a published source yet.
Arkansas Has
- USDA Zones: 6b-8b
- Last Hard Freeze (28°F): Mar 2 - Mar 20
- First Hard Freeze (28°F): Nov 15 - Nov 23
- Annual Rainfall: 44-56 inches
- Common Soils: Silt loam, Sandy loam, Red clay
Plant Zone Range (zones 5-9)
Preferred Soil pH
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 — per-field provenance varies and is published with the dataset. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Sweet Alyssum in Arkansas
The frost window
Across Arkansas, the last spring hard freeze (28°F) clears between Mar 2 and Mar 20, and the first fall hard freeze lands between Nov 15 and Nov 23 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 240-day window you can count on — up to 266 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 sweet alyssum goes out, not when it starts. It is sown under cover about 4 weeks ahead, so counting back from Arkansas's late-side last freeze of Mar 20 is what fixes your sowing date — and a yard that clears frost earlier than the state's late date starts earlier still.
Winter standing
Arkansas runs as cold as USDA zone 6, and no sourced winter-hardiness floor is on record for sweet alyssum, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether sweet alyssum is a permanent planting or a replant-every-spring crop for you turns on your own zone within Arkansas; check its hardiness range against that before treating it as long-lived ground.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: Growable Ground Plant Database — frost-free days from FAO ECOCROP, days to harvest from university Extension production guides, and growing-degree-day and chill-hour minimums that are compilation estimates rather than published figures. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
Sweet Alyssum is grown in zones 5–9, which covers every zone Arkansas contains (6b-8b). It is grown as a summer crop, so season length decides it here. Arkansas's typical season runs ~254 frost-free days against the ~40 sweet alyssum needs.
Frost-free days
Sweet Alyssum wants 40+ frost-free days; a typical Arkansas site sees ~254 (NOAA Regional Climate Centers ACIS, 1991-2020). That leaves comfortable headroom for succession planting.
Growing degree days
Sweet Alyssum needs ~600 GDD (base 50°F) to ripen. We haven't confirmed this against a published source yet. The state median runs ~4819 GDD (from PRISM 1991-2020 climate normals), so Arkansas'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
Sweet Alyssum likes near-neutral soil (pH 6-7). That's the common-ground band across Arkansas's silt loam and sandy loam — a soil test confirms it for your site. Drainage matters: this plant wants well (dry spells). If your Arkansas site is heavier clay or sits in a low spot, a raised bed lifts the roots above wet ground, or work in compost. pH range and drainage need: We haven't confirmed this against a published source yet.
Plant pH requirements: FAO ECOCROP and USDA PLANTS, with the remaining rows from other published sources or Growable Ground compilation. Drainage: FAO ECOCROP, with the remaining rows from other published sources or Growable Ground compilation. Arkansas soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
What Else to Consider for Sweet Alyssum in Arkansas
The zone range tells you where sweet alyssum is grown — but Arkansas growers also need to think about:
Hot, humid summers drive fungal and bacterial diseases
Heavy clay soils in parts of the Ozarks
Severe spring storms and hail risk
What to actually do about these — and the constraints that apply to every Arkansas grower, not just sweet alyssum — is covered on the Arkansas growing guide.
Timing shifts within Arkansas
Sweet Alyssum needs about 40 days of frost-free season to complete its cycle. Even Benton County — Arkansas’s shortest season at 226 frost-free days — clears that by 186 days, so season length isn’t the constraint anywhere in Arkansas. What varies is your own parcel.
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"). Sweet Alyssum's 40-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
Sweet Alyssum draws honeybees, native bees, and butterflies (high value). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, sweet alyssum can only work that bloom inside Arkansas's frost window — roughly 254 days, opening after the last 28°F freeze (Mar 2 - Mar 20) and closing at the first (Nov 15 - Nov 23), per NOAA Regional Climate Centers ACIS, 1991-2020. Pollinator value: We haven't confirmed this against a published source yet.
Arkansas Cooperative Extension
For Arkansas-specific cultivar recommendations, planting calendars, and pest pressure for sweet alyssum, the canonical source is University of Arkansas Cooperative Extension Service. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Sweet Alyssum native to Arkansas?
No — the USDA PLANTS Database lists Sweet Alyssum as introduced rather than native in the Lower 48, so it is not part of Arkansas's native flora. It grows here as a garden plant; pairing it with a few Arkansas natives keeps local pollinators fed too.
Looking for plants that belong here? The Arkansas growing guide lists plants that USDA PLANTS records growing in Arkansas and that Kew and NatureServe Explorer both list in its native range, leaving out any that NatureServe flags as exotic there or that our audit holds.
State records: USDA PLANTS Database state-distribution data (presence, not state-level nativity), accessed 2026-10-19.
Common Questions About Growing Sweet Alyssum in Arkansas
When can I plant Sweet Alyssum in Arkansas?
Arkansas's last spring hard freeze (28°F) clears between Mar 2 and Mar 20, and the first fall hard freeze lands between Nov 15 and Nov 23 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Sweet Alyssum, so this page does not state whether it overwinters in Arkansas 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 Sweet Alyssum grown in across Arkansas?
Arkansas spans USDA hardiness zones 6b-8b (USDA ARS PHZM 2023). Sweet Alyssum carries a range of zones 5-9, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Arkansas site have?
A typical Arkansas site sees ~254 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Sweet Alyssum needs 40+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Sweet Alyssum native to Arkansas?
No — the USDA PLANTS Database lists Sweet Alyssum as introduced rather than native in the Lower 48, so it is not part of Arkansas's native flora. It grows here as a garden plant; pairing it with a few Arkansas natives keeps local pollinators fed too.
How should I amend the soil for Sweet Alyssum in Arkansas?
Sweet Alyssum prefers pH 6-7 and well (dry spells) drainage. We haven't confirmed this against a published source yet. That sits in the common-ground band across Arkansas soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Sweet Alyssum actually grow on my specific land in Arkansas?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores sweet alyssum against your address's mapped soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in Arkansas
State-level data is a sketch. Your Growable Ground report scores sweet alyssum against your land's mapped soil, modelled sun, drainage, and frost data — not zone averages.
Three things about your lot that Arkansas sweet alyssum averages can't show:
We read public map data around Arkansas — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Arkansas sweet alyssum average
Explore More
Growing guides for sweet alyssum
Explore Arkansas county by county
Arkansas carries 75 counties with their own USDA zone — a sample of the growing pages for sweet alyssum there:
Where else sweet alyssum grows
Sweet Alyssum's zone band crosses state lines — these are the states closest to Arkansas in winter climate where it also has a page, plus the far ends of its range. Each one re-answers the question with that state's own record.
More to grow in Arkansas
Arkansas has a growing page for 1,012 plants — a rotating sample of the rest of the shelf.
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