Conditional — Some Areas
phacelia (zones 2-11) has limited zone overlap with Mississippi (7b-9a). Only zones 7-9 in the state are suitable.
Your yard isn't the whole zone.
Phacelia is grown as an annual, so your winter zone isn't the deciding factor — your frost-free window is, and slope, trees, and low spots move the last-frost date across a single yard. Enter your address and we'll score phacelia against your parcel's actual frost dates, sun, and soil.
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Zone Comparison
Phacelia Needs
- USDA Zones: 2-11
- Soil pH: 6.4 - 8.6
- Sun: Full Sun
- Drainage: well (dry spells)
- Frost-Free Days: 100+
Mississippi Has
- USDA Zones: 7b-9a
- Last Frost: Feb 28 - Mar 30
- First Frost: Oct 25 - Nov 20
- Annual Rainfall: 50-65 inches
- Common Soils: Loess, Alluvial clay, Sandy loam
Plant Zone Range (zones 2-11)
Preferred Soil pH
Plant data: USDA PLANTS Database / plant_species_v5.csv. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Phacelia in Mississippi
The frost window
Across Mississippi, the last spring frost clears between Feb 28 and Mar 30, and the first fall frost lands between Oct 25 and Nov 20 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 209-day window you can count on — up to 265 days on a mild site in a kind year.
Frost tenderness
Phacelia is frost-tender — its listed minimum temperature is 52°F (USDA PLANTS Database) — so set plants out after the last frost has cleared your local site, not the state's earliest date.
Days to maturity vs. the window
At 45 days to maturity (USDA PLANTS Database), a planting right after last frost ripens with 164 days to spare even in Mississippi's tightest frost scenario — room for a later start or a second sowing.
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
Zone compatibility says you can survive winter here. Whether the growing season is long enough — and warm enough — is a different question.
Frost-free days
Phacelia wants 100+ frost-free days; a typical Mississippi site sees ~220 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Growing degree days
Phacelia needs ~1000 GDD (base 50°F) to ripen. The state median runs ~5000 GDD (USDA NRCS county aggregates), so Mississippi's typical season clears that easily.
Climate aggregates derive from USDA NRCS county-level hardiness data + Cornell CALS Extension GDD-by-region tables + MSU Extension chill-hours-by-zone (1991-2020 NOAA Climate Normals baseline).
Soil + Drainage Fit
Phacelia likes near-neutral soil (pH 6.4-8.6). That's the common-ground band across Mississippi's loess and alluvial clay — a soil test confirms it for your site. Drainage matters: this plant wants well (dry spells). If your Mississippi site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Plant pH and drainage requirements from USDA PLANTS Database. Mississippi soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Phacelia in Mississippi — Quick Answer
- Verdict: Conditional — Some Areas
- Plant Zones: 2-11 (USDA PLANTS Database)
- State Zones: 7b-9a (USDA ARS PHZM 2023)
- Growing Season: Feb 28 - Mar 30 to Oct 25 - Nov 20 (NOAA Climate Normals)
- Days to Maturity: 45 days
What Else to Consider
Zone compatibility tells you about winter cold survival — but Mississippi growers also need to think about:
Extreme summer heat and humidity
Run the garden on the generous spring and fall windows — and let summer belong to okra, peas, and sweet potatoes.
Heavy alluvial clay in the Delta region
Delta clay is rich but slow to drain — raised rows get roots above the wet while keeping that fertility in reach.
Frequent severe storms and flooding
Site beds on the high ground, mound the rows, and keep water moving — drainage planning is storm insurance.
Pollinator + Wildlife Value
Phacelia draws pollinators (high value, USDA PLANTS Database). Planting it near vegetable beds can lift fruit set on neighboring crops.
Mississippi Cooperative Extension
For Mississippi-specific cultivar recommendations, planting calendars, and pest pressure for phacelia, the canonical source is Mississippi State University Extension Service. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Phacelia native to Mississippi?
Phacelia is native to parts of the Lower 48, but the USDA PLANTS Database (accessed 2026-07-01) does not document a native range in Mississippi. It can still earn a place in a Mississippi garden — the zone comparison above tells you whether it will thrive.
Looking for plants that belong here? The Mississippi 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 Phacelia in Mississippi
When can I plant Phacelia in Mississippi?
Mississippi's last spring frost clears between Feb 28 and Mar 30, and the first fall frost lands between Oct 25 and Nov 20 (NOAA Climate Normals 1991-2020). Phacelia is frost-tender — its listed minimum temperature is 52°F (USDA PLANTS Database) — so wait until the last frost has cleared your specific site before planting out.
Can Phacelia mature before first frost in Mississippi?
Yes — Phacelia matures in 45 days (USDA PLANTS Database), and Mississippi's dependable frost-free window runs 209 days (NOAA Climate Normals 1991-2020), leaving 164 days of margin. Plant just after last frost and it ripens ahead of the first fall frost.
What hardiness zone is Phacelia grown in across Mississippi?
Mississippi spans USDA hardiness zones 7b-9a (USDA ARS PHZM 2023). Phacelia carries a range of zones 2-11, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Mississippi site have?
A typical Mississippi site sees ~220 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Phacelia needs 100+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Phacelia native to Mississippi?
Phacelia is native to parts of the Lower 48, but the USDA PLANTS Database (accessed 2026-07-01) does not document a native range in Mississippi. It can still earn a place in a Mississippi garden — the zone comparison above tells you whether it will thrive.
How should I amend the soil for Phacelia in Mississippi?
Phacelia prefers pH 6.4-8.6 and well (dry spells) drainage (USDA PLANTS Database). That sits in the common-ground band across Mississippi soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Phacelia actually grow on my specific land in Mississippi?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores phacelia 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 Mississippi
State-level data is a sketch. Your Growable Ground report scores phacelia against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
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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