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Ulmus thomasii - Sarg.

Common Name Rock Elm
Family Ulmaceae
USDA hardiness Coming soon
Known Hazards None known
Habitats Rich woods and calcareous uplands[43]. Dry gravelly uplands, low heavy clay soils, rocky slopes and river cliffs[82].
Range Central and Northeastern N. America - Quebec to Ontario, Minnesota, Kentucky, Missouri and Nebraska.
Edibility Rating    (1 of 5)
Other Uses    (0 of 5)
Weed Potential No
Medicinal Rating    (0 of 5)
Care
Fully Hardy Moist Soil Semi-shade Full sun
Ulmus thomasii Rock Elm


USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 1
Ulmus thomasii Rock Elm
W.D. Brush @ USDA-NRCS PLANTS Database

 

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Summary


Physical Characteristics

 icon of manicon of lolypop
Ulmus thomasii is a deciduous Tree growing to 30 m (98ft 5in) at a slow rate.
It is hardy to zone (UK) 2 and is not frost tender. It is in flower in April, and the seeds ripen in May. The species is hermaphrodite (has both male and female organs) and is pollinated by Wind.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils, prefers well-drained soil and can grow in nutritionally poor soil. Suitable pH: acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist soil.

UK Hardiness Map US Hardiness Map

Synonyms

U. racemosa. Thomas.

Habitats

Woodland Garden Canopy;

Edible Uses

Edible Parts: Leaves
Edible Uses:

Leaves - raw or cooked.

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.


None known

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Other Uses

Wood

Wood - very strong, hard, heavy, tough, elastic, durable, close and beautifully grained, difficult to split. It weighs 45lb per cubic foot and is used for furniture, agricultural implements, wheel hubs and other purposes demanding toughness, solidity and flexibility[46, 61, 82, 171, 226, 229, 235].

Special Uses

Cultivation details

Prefers a deep fertile soil in full sun[188, 229], but can be grown in any soil of at least moderate quality so long as it is well drained[1]. Plants are tolerant of poor soil conditions in the wild[229]. Although perfectly hardy, this species does not thrive in Britain[1, 11]. It is very slow growing, even in its native range[11]. Susceptible to 'Dutch elm disease', a disease that has destroyed the greater part of all the elm trees growing in Britain. The disease is spread by means of beetles. There is no effective cure (1992) for the problem, but most E. Asian, though not Himalayan, species are resistant (though not immune) to the disease so the potential exists to use these resistant species to develop new resistant hybrids with the native species[200]. The various species of this genus hybridize freely with each other and pollen is easily saved, so even those species with different flowering times can be hybridized[200].

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Plants For A Future have a number of books available in paperback and digital form. Book titles include Edible Plants, Edible Perennials, Edible Trees, and Woodland Gardening. Our new book to be released soon is Edible Shrubs.

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Propagation

Seed - if sown in a cold frame as soon as it is ripe, it usually germinates within a few days[200]. Stored seed does not germinate so well and should be sown in early spring[200]. The seed can also be harvested 'green' (when it has fully developed but before it dries on the tree) and sown immediately in a cold frame. It should germinate very quickly and will produce a larger plant by the end of the growing season[80]. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts. Plants should not be allowed to grow for more than two years in a nursery bed since they form a tap root and will then move badly. Layering of suckers or coppiced shoots[200].

Other Names

If available other names are mentioned here

Found In

Countries where the plant has been found are listed here if the information is available

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

Conservation Status

IUCN Red List of Threatened Plants Status :

Related Plants
Latin NameCommon NameHabitHeightHardinessGrowthSoilShadeMoistureEdibleMedicinalOther
Ulmus alataWinged ElmTree15.0 6-9 FLMHSNM20 
Ulmus americanaAmerican Elm, Gray Elm, Water ElmTree25.0 3-9 MLMHSNM22 
Ulmus davidianaJapanese ElmTree15.0 4-8  LMHSNM20 
Ulmus glabraWych Elm, Table-top Scotch Elm, Scotch ElmTree30.0 5-7 FLMHSNM32 
Ulmus japonicaJapanese ElmTree35.0 4-8  LMHSNM21 
Ulmus laciniata Tree10.0 4-8  LMHSNM20 
Ulmus macrocarpa Tree10.0 4-8  LMHSNDM21 
Ulmus parvifoliaChinese Elm, Lacebark ElmTree18.0 5-10 MLMHSNM210
Ulmus proceraEnglish ElmTree35.0 5-9 FLMHSNM32 
Ulmus pumilaSiberian Elm, Hybrid elmTree15.0 4-9 FLMHSNDM220
Ulmus rubraSlippery ElmTree20.0 3-7 MLMHSNM253
Ulmus villosaCherry Bark ElmTree25.0 4-8  LMHSNM10 
Ulmus wallichiana Tree35.0 5-9  LMHSNM11 

 

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Botanical References

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