Sorbus 'Joseph Rock' – Sorbus 'Joseph Rock'

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Rosaceae

Sorbus 'Joseph Rock' – Sorbus 'Joseph Rock'

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This is a very remarkable hybrid, origin unknown. The tree grows narrowly pyramidal to a height of approx. 8 m and is very compact. The leaves, up to approx. 16 cm in size, are imparipinnate and consist of 15 - 19 narrow obovate leaflets. In the autumn they turn red-orange to purple and, together with the remarkable fruits, constitute the major ornamental factor. At first the fruits are creamy yellow but later turn dark yellow to amber. 'Joseph Rock' is very inconsistent in the amount of fruit it bears. But the fruit stays on the tree for a long time, sometimes until mid-December, and contrasts well with the leaves' autumn colours. Unfortunately this handsome tree is sensitive to bacterial fire blight.

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Specifications
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Height
6 - 8 m
Crown
narrow pyramidal, dark, dense crown
Bark and branches
greyish-brown, twigs greenish-brown
Leaf
imparipinnate, 8 - 16 cm, 15 - 19 leaf segments, dark green, feathered leaf
Autumn colour
red, purple
Flowers
white, in umbels of 8 - 15 cm Ø, May/June
Fruits
creamy yellow, later amber yellow, remain on the tree for a long time
Spines/thorns
None
Toxicity
usually not toxic to people, (large) pets and livestock
Soil type
makes few demands, can grow on poor soils
Soil moisture
suitable for dry soil
Paving
tolerates no paving
Winter hardiness zone
6a (-23,3 to -20,6 °C)
Wind resistance
very good
Other resistances
resistant to frost (WH 1 - 6), can withstand wind
Fauna tree
valuable for bees (honey plant), provides food for birds
Application
parks, cemeteries, large gardens, small gardens
Shape
clearstem tree
Origin
unknown
Clear stem tree loamy soil nutrient-poor soil sandy soil tolerates no paving resistant to frost (WH 1 - 6) suitable for dry soil can withstand wind narrow conical 2nd size, between 6 and 12 metres dense crown green white May early sprout average growing Conspicuous bloom Feathered leaf Attractive autumn colour valuable for bees (honey plant) provides food for birds non-toxic (usually) Ornamental fruit
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Frequently asked questions
Sorbus 'Joseph Rock'

Sorbus 'Joseph Rock' can eventually reach a height of 6 - 8 m, depending on the site and climate conditions.

Sorbus 'Joseph Rock' is average growing and can eventually reach a height of 6 - 8 m, depending on the site and climate conditions.

The leaves of Sorbus 'Joseph Rock' turn red, purple in autumn.

The right time to plant Sorbus 'Joseph Rock' is during the dormancy period. In Western Europe, Sorbus 'Joseph Rock' with root balls can generally be planted from mid-November to late April, although this depends strongly on the climatic conditions and the species of tree.

Sorbus 'Joseph Rock' blooms in may.
General