Index / Search / Rudbeckia maxima
§1 Plant
Rudbeckia maxima Nutt.
vernacular great coneflower — species · Asteraceae
§2Habit & range
Habit and range
- Growth habit
- Forb/herb
- Duration
- Perennial
- Group
- Dicot
- Family
- Asteraceae Bercht. & J. Presl
- Genus
- Rudbeckia
§2a
Native status, by region
- L48 Lower 48 States Native
§2b
County-level range
· 38 counties across 3 states/territories§3Cultivation specs · USDA
Recorded by the USDA Plant Materials Program.
§3a
Tolerances
- Drought
- None
- Shade
- High
- Moisture use
- High
- Fire
- None
- Salinity
- None
- Anaerobic
- High
- CaCO₃
- Low
- Hedging
- None
§3b
Climate & soil
- Cold tolerance
- -23 °F minimum
- Frost-free days
- 180 min.
- Precipitation
- 40–60 in/yr
- pH range
- 4–7
- Root depth
- 12 in min.
- Fertility need
- Medium
- Soil texture
- coarse, medium, fine
§3c
Form & growth
- Growth form
- Single Stem
- Growth rate
- Rapid
- Lifespan
- Short
- Mature height
- 9.8 ft
- Foliage texture
- Coarse
- Foliage colour
- Gray-Green
- Porosity (summer)
- Porous
- Porosity (winter)
- Porous
- Flower colour
- Yellow
- Fruit colour
- Black
- Fire resistant
- No
- N fixation
- None
- Toxicity
- None
§3d
Reproduction
- Bloom period
- Summer
- Seed abundance
- Medium
- Seed begins
- Summer
- Seed ends
- Fall
- Spread rate
- Moderate
- Stratify
- No
- Seeds / lb
- 1,000,000
- Propagation
- seed, container
§3e
Use & availability
- Commercial availability
- No Known Source
- Nursery stock
- No
- Browse palatability
- High
- Graze palatability
- High
- Palatable, human
- No
- Lumber
- No
- Christmas tree
- No
§4Counties, by state
Recorded in 38 counties across 3 states/territories.
Arkansas view state ↗ 3 N ▾
Louisiana view state ↗ 9 N ▾
Texas view state ↗ 26 N ▾
- Anderson 48001
- Bowie 48037
- Cherokee 48073
- Dallas 48113
- Fannin 48147
- Freestone 48161
- Grayson 48181
- Gregg 48183
- Harrison 48203
- Hopkins 48223
- Houston 48225
- Kaufman 48257
- Lamar 48277
- Madison 48313
- Nacogdoches 48347
- Red River 48387
- Robertson 48395
- Sabine 48403
- San Jacinto 48407
- Smith 48423
- Tarrant 48439
- Upshur 48459
- Van Zandt 48467
- Walker 48471
- Waller 48473
- Wood 48499
§5Sources & provenance
USDA PLANTS
Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.
plants.usda.gov/RUMA3 ↗GBIF Backbone
Canonical taxonomic identity, synonym resolution, cross-refs. CC0.
gbif.org/species/3114231 ↗Record version
Cached and built locally. Source version on this record:
usda-plants-mt-2026-05-26
fetched 2026-05-26T10:50:45Z