Cormus domestica

True service tree (Cormus domestica)
Scientific name	Cormus domestica[1]
Genus	Cormus
Family	Rosaceae
Order	Rosales
Habit	Deciduous tree, usually 9–15 m tall
Fruit	Pear-shaped to subglobose pome, about 2.5–3 cm long[2]

Cormus domestica, the true service tree or sorb tree, is a deciduous fruiting tree in the rose family. The accepted name is Cormus domestica; Sorbus domestica and Pyrus domestica remain important names in horticultural and taxonomic references.^[1][2] Its fruit is traditionally eaten after it softens through bletting rather than while it is hard and tannin-rich.

Description

The tree is usually 9–15 m tall, although larger trees of about 20–30 m are recorded. It has pinnate leaves and white to cream flowers carried in clusters about 6–10 cm across. The pomes are pear-shaped to subglobose and approximately 2.5–3 cm long.^[2]

Cormus domestica occurs in woodland, heathland, hedges, ledges and scree across sites from sea level to about 1250 m in the specialist botanical treatment.^[2] The combination of deciduous growth and tolerance of exposed, relatively dry habitats is useful context when siting it in cultivation.

Cultivation

Soil and water

The species is associated with varied soils, including lime-bearing ground, and is described as drought tolerant once established. It prefers drier sites, so good drainage is a more useful starting point than a permanently wet root zone; prolonged saturation is a poor fit for that reported preference.^[2][3]

Sun and humidity

Warm, bright positions suit the reported ecology of the species, and fruiting is better in sun than in shade in the horticultural summaries.^[2][3] Hardiness to about −30 °C is given in the specialist treatment, while another horticultural account describes only moderate cold hardiness; this difference makes the figure an attributed approximation rather than a universal limit.^[2][3]

Seasonal changes

As a deciduous tree, it has a leafless cool-season phase. An apple-fruited form is documented with early-autumn ripening, but that timing should not be applied to every fruit form or site.^[3] A two-or-three-year high-yield interval is attributed to Kausch-Blecken von Schmeling (2000), while a Croatian report by Drvodelić (2010) records high yields every four years; neither interval should be treated as a universal annual pattern.^[2]

Propagation

Seed dormancy requires cold stratification. A propagation recommendation is 90–120 days at about 4 °C followed by warm conditions; seed is also vulnerable to fungal problems and germination declines during storage.^[2] The schedule is a reported recommendation rather than a demonstrated controlled result.

Seedlings can be kept in pots in a cold frame for their first winter and planted out in late spring, a handling sequence given in a horticultural database under the synonym Sorbus domestica.^[3] Root suckers are common. Grafting reports conflict: same-species seedlings, quince and Crataegus are all mentioned as rootstock possibilities, but their relative performance is unresolved and no universal rootstock choice is warranted.^[2]

Flowering, fruiting, and harvest

White to cream flowers are produced in clusters about 6–10 cm across. The fruit is a small pome, pear-shaped to subglobose and about 2.5–3 cm long.^[2] Early-autumn ripening is documented for an apple-fruited form. A two-or-three-year high-yield interval is attributed to Kausch-Blecken von Schmeling (2000), while a Croatian report by Drvodelić (2010) records high yields every four years; neither interval should be treated as a universal annual pattern.^[2][3]

Hard fruit is tannin-rich and bitter. It becomes softer and sweeter during bletting, when it is described as palatable; harvesting and use should therefore be based on the fruit's texture and ripeness rather than on the firm stage.^[2]

Fruit and uses

After bletting, the fruit has a traditional food use and has also been used in fermented drinks. The documented change from astringent hard fruit to softer, sweeter fruit does not establish medicinal properties or broad food-safety assurances.^[2]

Cultivars and selections

Documented fruit-form groups include Maliform and Pyriform. Named large-fruited selections include Sossenheimer Riese, Géant de Saint-Germain, Periforme ottobrino, Meliforme ottobrino and Rugginoso settembrino.^[2] These names are useful leads for locating planting material, but they do not form a comparative ranking of fruit quality, bearing, climate adaptation, propagation compatibility or storage performance. Few named cultivars are reported to have entered general commerce.^[2]

Photos

References

• ↑ [1] GBIF species match: Cormus domestica.

• ↑ [2] Cormus domestica — Trees and Shrubs Online, Roderick Cameron and Rowan Griffiths.

• ↑ [3] Sorbus domestica — Useful Temperate Plants.

Image credits

• Sorbus domestica-Cormier.jpg — whole tree; Colsu; CC BY-SA 4.0. File page

• Sorbus domestica 150912.jpg — tree in Tauberland; BerndH; CC BY-SA 3.0. File page