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Pedunculate oak 'Dąb Chrobry' in Piotrowice in Szprotawa

There is one pedunculate oak (Quercus robur) in Piotrowice in Szprotawa (powiat of Żagań).

This tree is called "Dąb Chrobry". This is Polish for the Oak of Chrobry. Of this oak the age is estimated by several Polish tree experts as around 750 years. Based on the growth of the circumference in the last century Jeroen Pater estimates it as about 550 years old. Of all Polish oaks this one has the largest trunk volume. The total volume is estimated to be 90 cubic meter. After the oak of Ivenack it is one of the largest oaks in Europe.

Girth growth rate

The girth was measured more than once:
YearGirth@1.3 mMeasurementGirth growth rate
19999.92 mJeroen Philippona-
20019.95 mJeroen Pater1 cm/year
200910.10 mPiotr Gach2 cm/year

The growth rate shown in the table shows the yearly average increase in girth since the last measurement. This value only gives an indication of the growth rate, since every measurement could be done at slightly different heights and during different periods of the year.


The height was measured more than once:
YearHeightMeasurementMeasurement method
1999-11-15~27.00 m Jeroen PhilipponaMeasurement with a stick of known size
200928.00 mPiotr GachLaser with Sine method (e.g. Nikon Forestry 550 laser rangefinder)

Each measurement can be done with varying accuracy.This tree was planted around the year 1260 ± 10, which makes it around 754 ± 10 years old (Tim B, Oct 1, 2011).

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Dąb Chrobry (pedunculate oak "1786")

Piotrowice, picture by Pl Wikipedia User Skarabeusz

Piotrowice, picture by Panoramio User rem49

Piotrowice, picture by Jeroen Philippona

Photo November 15, 1999.

Piotrowice, picture by Jeroen Philippona

Piotrowice, picture by Jeroen Philippona

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Monumental trees in Żagań
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Monumental trees in Poland


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