The Oak of Grybiškės was included in the list of state protected natural heritage objects in 1999. The size of the oak trunk is 4.98 m, diameter - about 1.6 m, height - about 26 m. In 1971, the largest Lithuanian boletus mushroom was found near Grybiškės oak, which was registered in the Lithuanian record book. The boletus weighed 3.05 kg and the diameter of the cap was 0.49 m. The age of the oak of Grybiškės - about 1000 years.