In the year of 2012, 206 new trees made the lists. All together, 43 genera are represented by 1584 trees. Every year, roughly 200 new trees are discovered (about half of them simply grow up to reach the listed lower limit).
There are currently 427 trees with a girth over 6 m. Their distribution: 187 poplars, 87 oaks, 55 willows, 49 plane trees, 24 chestnuts, 11 lime trees, 5 sequioas, 3 ash trees, 2 beech trees, 1-1 maple, Sophora, Juglans, Corylus. It is anticipated that new poplars and willows will be the easiest to find in the coming years.
Ther are 5 single-trunk trees with a girth over 10 m: black poplar of Révfalu/Drávakeresztúr ~1066 cm (1065 cm/2011), lime of Ötvöskónyi ~1060 cm (1038 cm/2003), plane of Peresznye 1033 cm, plane of Pápa 1019 cm, black poplar of Barcs ~1010 cm (1006 cm/2010), black poplar of Vindornyalak 1010 cm.
A few conclusions, based on the data:
Growth rate of a tree depends on several factors, including the local climate and soil, or the age of the tree. However, based on the re-measuring of many trees, we can conclude that a large tree in relatively good health can increase in girth at the following rate:
chestnut 1-2 cm/year
beech 2-3 cm/year
oak 2-3 cm/year
poplar 5-9 cm/year
plane 5 cm/year
lime 2-4 cm/year
ash 4-5 cm/year
willow 5-9 cm/year
elm 2 cm/year
Under the Hungarian climatic conditions, the maximum girth (with rare exceptions) for our trees are:
oak 7,5 m
beech 6 m
plane >11 m
poplar 10,5 m
sequoia 7 m
hornbeam 5,5 m
chestnut 8,5 m
willow 9 m
ash 7 m
Remarkably, the plane trees show no signs of bad health, and even the largest ones grow at a high rate. I predict that by 2020, the largest, healthy tree will be the plane of Peresznye with a girth of ~1070 cm.
The most remarkable new finds in 2012 are: the black poplar of Vindornyalak (1010 cm, László Bognár), and a white willow in Gemenc (894 cm, Adrien Fekete and Gergely Szombathelyi).
There were two dendromaniac meetings:
In spring, Géza Vissi hosted the group in the county of Zala, showing many remarkable oaks. In the fall, Attila Jandala helped us to explore the beeches of a neglected, but beautifulé area in Nógrád county.