Index / Search / Ulmus thomasii
§1 Plant
Ulmus thomasii Sarg.
vernacular rock elm — species · Ulmaceae
§2Habit & range
Habit and range
- Growth habit
- Tree
- Duration
- Perennial
- Group
- Dicot
- Family
- Ulmaceae Mirb.
- Genus
- Ulmus
§2a
Native status, by region
- CAN Canada Native
- L48 Lower 48 States Native
§2b
County-level range
· 237 counties across 17 states/territories§3Cultivation specs · USDA
Recorded by the USDA Plant Materials Program.
§3a
Tolerances
- Drought
- Low
- Shade
- Medium
- Moisture use
- High
- Fire
- Medium
- Salinity
- None
- Anaerobic
- None
- CaCO₃
- Medium
- Hedging
- None
§3b
Climate & soil
- Cold tolerance
- -46 °F minimum
- Frost-free days
- 120 min.
- Precipitation
- 22–60 in/yr
- pH range
- 4.5–7.2
- Root depth
- 40 in min.
- Fertility need
- Medium
- Soil texture
- coarse, medium, fine
§3c
Form & growth
- Growth form
- Single Stem
- Growth rate
- Moderate
- Lifespan
- Long
- Mature height
- 90 ft
- Height @ 20 y
- 12 ft
- Foliage texture
- Coarse
- Foliage colour
- Green
- Porosity (summer)
- Dense
- Porosity (winter)
- Porous
- Flower colour
- Yellow
- Fruit colour
- Brown
- Fire resistant
- No
- N fixation
- None
- Toxicity
- None
§3d
Reproduction
- Bloom period
- Mid Spring
- Seed abundance
- Medium
- Seed begins
- Spring
- Seed ends
- Spring
- Spread rate
- Slow
- Stratify
- No
- Seeds / lb
- 7,000
- Propagation
- seed, cuttings, bare root, container
§3e
Use & availability
- Commercial availability
- No Known Source
- Nursery stock
- No
- Browse palatability
- Low
- Palatable, human
- No
- Lumber
- Yes
- Fuelwood
- Medium
- Christmas tree
- No
§4Counties, by state
Recorded in 237 counties across 17 states/territories.
Arkansas view state ↗ 5 N ▾
Illinois view state ↗ 10 N ▾
Indiana view state ↗ 30 N ▾
- Allen 18003
- Carroll 18015
- Elkhart 18039
- Grant 18053
- Hamilton 18057
- Hendricks 18063
- Henry 18065
- Howard 18067
- Huntington 18069
- Jefferson 18077
- Johnson 18081
- Kosciusko 18085
- Lagrange 18087
- Marion 18097
- Miami 18103
- Monroe 18105
- Montgomery 18107
- Noble 18113
- Posey 18129
- Putnam 18133
- Ripley 18137
- Rush 18139
- St. Joseph 18141
- Steuben 18151
- Tipton 18159
- Vermillion 18165
- Vigo 18167
- Wabash 18169
- Wayne 18177
- Wells 18179
Iowa view state ↗ 7 N ▾
Kansas view state ↗ 2 N ▾
Kentucky view state ↗ 17 N ▾
Michigan view state ↗ 26 N ▾
- Antrim 26009
- Benzie 26019
- Genesee 26049
- Gladwin 26051
- Grand Traverse 26055
- Gratiot 26057
- Ingham 26065
- Ionia 26067
- Isabella 26073
- Kalamazoo 26077
- Kent 26081
- Lenawee 26091
- Macomb 26099
- Mecosta 26107
- Menominee 26109
- Missaukee 26113
- Monroe 26115
- Oakland 26125
- Oscoda 26135
- Saginaw 26145
- St. Clair 26147
- St. Joseph 26149
- Tuscola 26157
- Washtenaw 26161
- Wayne 26163
- Wexford 26165
Minnesota view state ↗ 25 N ▾
- Blue Earth 27013
- Cass 27021
- Chippewa 27023
- Chisago 27025
- Clearwater 27029
- Fillmore 27045
- Hennepin 27053
- Houston 27055
- Itasca 27061
- Jackson 27063
- Koochiching 27071
- Morrison 27097
- Olmsted 27109
- Otter Tail 27111
- Pine 27115
- Polk 27119
- Rice 27131
- Scott 27139
- St. Louis 27137
- Wabasha 27157
- Waseca 27161
- Washington 27163
- Watonwan 27165
- Wilkin 27167
- Winona 27169
Missouri view state ↗ 13 N ▾
Nebraska view state ↗ 3 N ▾
New Jersey view state ↗ 1 N ▾
New York view state ↗ 32 N ▾
- Broome 36007
- Cattaraugus 36009
- Cayuga 36011
- Chemung 36015
- Chenango 36017
- Clinton 36019
- Columbia 36021
- Cortland 36023
- Erie 36029
- Genesee 36037
- Greene 36039
- Herkimer 36043
- Jefferson 36045
- Lewis 36049
- Livingston 36051
- Madison 36053
- Monroe 36055
- Niagara 36063
- Oneida 36065
- Onondaga 36067
- Ontario 36069
- Saratoga 36091
- Schenectady 36093
- Schoharie 36095
- Schuyler 36097
- St. Lawrence 36089
- Tompkins 36109
- Warren 36113
- Washington 36115
- Westchester 36119
- Wyoming 36121
- Yates 36123
North Dakota view state ↗ 1 N ▾
Ohio view state ↗ 13 N ▾
Tennessee view state ↗ 15 N ▾
Vermont view state ↗ 6 N ▾
Wisconsin view state ↗ 31 N ▾
- Ashland 55003
- Barron 55005
- Brown 55009
- Clark 55019
- Dane 55025
- Florence 55037
- Forest 55041
- Grant 55043
- Kewaunee 55061
- Langlade 55067
- Lincoln 55069
- Manitowoc 55071
- Marathon 55073
- Marinette 55075
- Menominee 55078
- Milwaukee 55079
- Oconto 55083
- Oneida 55085
- Outagamie 55087
- Pierce 55093
- Polk 55095
- Portage 55097
- Price 55099
- Richland 55103
- Rock 55105
- Sawyer 55113
- Shawano 55115
- Sheboygan 55117
- Taylor 55119
- Vernon 55123
- Waukesha 55133
§5Sources & provenance
USDA PLANTS
Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.
plants.usda.gov/ULTH ↗GBIF Backbone
Canonical taxonomic identity, synonym resolution, cross-refs. CC0.
gbif.org/species/5361875 ↗Record version
Cached and built locally. Source version on this record:
usda-plants-mt-2026-05-26
fetched 2026-05-26T14:42:51Z