Quercus robur 'Irtha' – Quercus robur 'Irtha'

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Fagaceae

Quercus robur 'Irtha' – Quercus robur 'Irtha'

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This tree originated as a seedling, probably from Q. robur ‘Cristata’ or ‘Strypemonde’. Grows more slowly than the species and remains smaller. It grows to a medium-size tree, 6 to 10 m tall with a somewhat irregular round crown. The bark and twigs are like those of the species, but the leaf is totally different. It is very deeply pinnately cleft to pinnately parted with narrow lobes that are also slightly dissected. The lobes are also slightly twisted. The striking leaf gives ‘Irtha’ a graceful appearance. Its modest size, for a Q. robur, makes it not only suitable as a park tree, but also for use in wide avenues.

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Specifications
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Height
6 - 10 m
Crown
round, half-open crown
Bark and branches
twigs reddish brown, bark dark grey, deeply grooved
Leaf
obovate, pinnately cleft to pinnately parted, lobes narrow and very deeply dissected, dark green, 5 - 14 cm
Flowers
green-yellow ♂ catkins, 2 - 4 cm, May
Fruits
ovate to oval, 1.5 - 2.5 cm, in groups of 2 - 6, cupule with triangular contiguous scales
Spines/thorns
None
Toxicity
usually not toxic to people, (large) pets and livestock
Soil type
fertile and moist
Soil moisture
suitable for wet soil
Paving
tolerates no paving
Winter hardiness zone
5a (-28,8 to -26,1 °C)
Wind resistance
good
Other resistances
resistant to frost (WH 1 - 6), can withstand wind, resistant to de-icing salt
Application
avenues and broad streets, parks, cemeteries, industrial areas, large gardens
Shape
clearstem tree
Origin
Bömer Tree Nursery, Zundert, the Netherlands, circa 1985
Clear stem tree acid soil calcareous soil loamy soil sandy soil tolerates no paving resistant to de-icing salt resistant to frost (WH 1 - 6) suitable for wet soil can withstand wind 2nd size, between 6 and 12 metres half-open crown green yellowgreen average growing non-toxic (usually)
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Frequently asked questions
Quercus robur 'Irtha'

Quercus robur 'Irtha' can eventually reach a height of 6 - 10 m, depending on the site and climate conditions.

Quercus robur 'Irtha' is average growing and can eventually reach a height of 6 - 10 m, depending on the site and climate conditions.

The right time to plant Quercus robur 'Irtha' is during the dormancy period. In Western Europe, Quercus robur 'Irtha' 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.

Quercus robur 'Irtha' blooms in may.
General