Unlikely — Zone Mismatch
brittlebush (zones 10-13) does not overlap with Maryland's zone range (5b-8a). Growing outdoors is unlikely without significant protection.
2 zones short — what would close it
Brittlebush is hardy to zone 10, and the warmest ground in Maryland is zone 8 — 2 zones short. Planted in open ground it will not survive a Maryland winter. To grow it here, grow brittlebush under glass — a greenhouse is the only lift this wide the engine models.
A greenhouse is the lift this needs. How a greenhouse changes what you can grow →
Zone math from 10-13 (plant) against 6-8 (Maryland). 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.
Maryland spans zones 5b-8a, 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 brittlebush against your parcel's actual hardiness, soil, and sun.
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Zone Comparison
Brittlebush Needs
- USDA Zones: 10-13
- Frost-Free Days: 365+
- Sun: Full Sun
- Mature size: 4 ft tall
- Drought tolerance: High
Maryland Has
- USDA Zones: 5b-8a
- Last Hard Freeze (28°F): Mar 18 - Mar 29
- First Hard Freeze (28°F): Nov 11 - Nov 27
- Annual Rainfall: 36-48 inches
- Common Soils: Silt loam, Clay, Sandy loam (Eastern Shore)
Plant Zone Range (zones 10-13)
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 Brittlebush in Maryland
The frost window
Across Maryland, the last spring hard freeze (28°F) clears between Mar 18 and Mar 29, and the first fall hard freeze lands between Nov 11 and Nov 27 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 227-day window you can count on — up to 254 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.
Winter standing
Maryland runs as cold as USDA zone 5, and no sourced winter-hardiness floor is on record for brittlebush, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether brittlebush is a permanent planting or a replant-every-spring crop for you turns on your own zone within Maryland; check its hardiness range against that before treating it as long-lived ground.
Timing tuned to sub-state frost dates — Garrett 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 brittlebush does not survive a Maryland 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 Maryland under protection.
Frost-free days
Brittlebush wants 365+ frost-free days; a typical Maryland site sees ~238 (NOAA Regional Climate Centers ACIS, 1991-2020) — 127 days short of what it needs. A typical Maryland 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.
Chill hours
Brittlebush has no winter-chill requirement — its listed minimum is 0 hours (USDA PLANTS Database). Maryland typically banks ~2500 chill hours per winter (from PRISM 1991-2020 climate normals), so chill is not a constraint on this plant here — and not evidence in its favour either. Winter survival and season length are what decide it.
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
Brittlebush likes near-neutral soil (pH 7-8.5). That's the common-ground band across Maryland's silt loam and clay — a soil test confirms it for your site.
Your land, not the state average
Maryland soil pH runs about 5.0–6.0, and that sits below brittlebush's tolerated 7–8.5, so the typical Maryland parcel needs lime before it will perform. SSURGO maps it swinging by full points parcel to parcel, so your map unit, not the state number, decides whether brittlebush needs lime or sulfur.
Check your parcel → Source: USDA NRCS SSURGO.
Plant pH and drainage requirements from USDA PLANTS Database. Maryland soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Brittlebush in Maryland — Quick Answer
- Verdict: Unlikely — Zone Mismatch
- Plant Zones: 10-13 (USDA PLANTS Database)
- State Zones: 5b-8a (USDA ARS PHZM 2023)
- Growing Season: 28°F hard freezes about Mar 18 - Mar 29 to Nov 11 - Nov 27 (NOAA Regional Climate Centers ACIS, 1991-2020)
What Else to Consider for Brittlebush in Maryland
Zone compatibility tells you about winter cold survival — but Maryland growers also need to think about:
Heavy Piedmont clay drains poorly
Humidity and heat in summer promote disease
Deer pressure in suburban areas is extreme
Growing brittlebush here specifically
Brittlebush wants soil pH 7.0–8.5, but Maryland's soils run acidic (SSURGO maps a dominant pH near 5.5) — below its range, nutrients lock up and growth stalls.
Test your soil and lime to raise pH into brittlebush's 7.0–8.5 range before planting. How to handle it →
What to actually do about these — and the constraints that apply to every Maryland grower, not just brittlebush — is covered on the Maryland growing guide.
Timing shifts within Maryland
Maryland isn't one climate. In Garrett County, the last hard freeze (28°F) holds until about Apr 22 — roughly 29 days later than the recorded state median — so plant brittlebush to your county's window, not the statewide date.
Brittlebush needs about 365 days of frost-free season to complete its cycle. No Maryland county gives it that outdoors: even Talbot County, the state’s longest season at 270 frost-free days, falls 95 days short — so it needs transplants, a short-season variety, or covered growing.
Across Maryland’s 24 counties the frost-free season runs from 190 days in Garrett County to 270 days in Talbot County — a spread of 80 days, which is why a single statewide planting date misleads. The median Maryland county sees 238 frost-free days, which is 127 days short of what brittlebush needs — so on a typical Maryland parcel this is a transplant-or-protect crop, not a direct-sow one.
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"). Brittlebush'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
Brittlebush draws honeybees, native bees, and butterflies (high value, Growable Ground Plant Database). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, brittlebush can only work that bloom inside Maryland's frost window — roughly 238 days, opening after the last 28°F freeze (Mar 18 - Mar 29) and closing at the first (Nov 11 - Nov 27), per NOAA Regional Climate Centers ACIS, 1991-2020.
Maryland Cooperative Extension
For Maryland-specific cultivar recommendations, planting calendars, and pest pressure for brittlebush, the canonical source is University of Maryland Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Brittlebush native to Maryland?
Brittlebush is native to parts of the Lower 48, but the USDA PLANTS Database (accessed 2026-07-01) does not document a native range in Maryland. It can still earn a place in a Maryland garden — the zone comparison above tells you whether it will thrive.
Looking for plants that belong here? The Maryland 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 Brittlebush in Maryland
When can I plant Brittlebush in Maryland?
Maryland's last spring hard freeze (28°F) clears between Mar 18 and Mar 29, and the first fall hard freeze lands between Nov 11 and Nov 27 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Brittlebush, so this page does not state whether it overwinters in Maryland 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 Brittlebush grown in across Maryland?
Maryland spans USDA hardiness zones 5b-8a (USDA ARS PHZM 2023). Brittlebush carries a range of zones 10-13, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Maryland site have?
A typical Maryland site sees ~238 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Brittlebush 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 Garrett, the freeze-free season runs shorter than the state average, so verify your own county's window.
Is Brittlebush native to Maryland?
Brittlebush is native to parts of the Lower 48, but the USDA PLANTS Database (accessed 2026-07-01) does not document a native range in Maryland. It can still earn a place in a Maryland garden — the zone comparison above tells you whether it will thrive.
How should I amend the soil for Brittlebush in Maryland?
Brittlebush prefers pH 7-8.5 (USDA PLANTS). That sits in the common-ground band across Maryland soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Brittlebush actually grow on my specific land in Maryland?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores brittlebush 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 Maryland
State-level data is a sketch. Your Growable Ground report scores brittlebush against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that Maryland brittlebush averages can't show:
We read public map data around Maryland — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Maryland brittlebush average
Explore More
Growing guides for brittlebush
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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