This page contains specific information about Ginkgo (Ginkgo biloba) '1752', which can be found in the Hortus Botanicus in Leiden.
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.
Each measurement can be have been done with varying accuracy.
(nl) "Dit is een mannelijke ginkgo. In het verleden zijn er diverse vrouwelijke takken op geënt. Daarvan is er één overgebleven en deze is gaan wortelen. Op de foto's uit januari 2014, zie je daarop zaden. Links heeft zich een soort heksenbezem gevormd.
Meer informatie over deze boom is te vinden in het Landelijk Register Monumentale Bomen van de Bomenstichting."
Girth growth rate
The girth was measured more than once:| Year | Girth @1 m | Girth @1.3 m | Measurement | Girth growth rate |
| 1931 | 3.40 m | ? | Jan Hengstmengel | - |
| 2009 | ? | 4.40 m | Sorbus | - |
| 2011 | ? | 4.40 m | Wim Brinkerink | 0 m/year |
| 2014 | ? | 4.40 m | Wim Brinkerink | 0 m/year |
| 2015 | ? | 4.45 m | Wim Brinkerink | 5 cm/year |
| 2018 | ? | 4.49 m | Wim Brinkerink | 1 cm/year |
| 2021 | ? | 4.53 m | Wim Brinkerink | 1 cm/year |
| 2023 | ? | 4.55 m | Wim Brinkerink | 1.0 cm/year |
Height
The height was measured more than once:| Year | Height | Measurement | Measurement method |
| 1817 | ~9 m | Jan Hengstmengel | Measurement taken from book, in which the exact measurement method is not elaborated |
| 1931 | ~23.60 m | Jan Hengstmengel | Measurement taken from book, in which the exact measurement method is not elaborated |
| 2013-05-15 | 20.60 m | Wim Brinkerink | Laser with Two-point measurement (e.g. Nikon Forestry 550/Pro) - sine method |
| 2014-02-24 | 21.40 m | Wim Brinkerink | Laser with Two-point measurement (e.g. Nikon Forestry 550/Pro) - sine method |
Age
The age of the tree was estimated by these persons:| Year | Planting or germination year | Age | Measurement |
| Oct 1, 2011 | 1785 | 239 y | Tim B |
| Sep 14, 2018 | 1785 | 239 y | Jan Hengstmengel |
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Photos
The photos are provided by Vincent Mauritz, Wim Brinkerink, and Sisley.
18th of August 2007
18th of August 2007
18th of August 2007
