The Oak Grove stretches over an area of 5 ha. The oldest oaks here are about 140–170 years old. This Grove is one of the key habitats of the forests of Dzūkija National Park as it still has dried out and fallen trees and stumps which are necessary for the preservation of the biological diversity. The Oak Grove also has other trees and shrubs apart from oaks. The forest is comprised of the canopy (the older and taller trees), understory (young trees), shrub layer (bushes), herbaceous layer and forest floor (fallen leaves, branches and fruits). Based on the height of the predominant vegetation, the forest has several strata. The highest trees grow in the top stratum and the plants requiring less light dominate the lower strata. The forest floor consists of lichen, moss, mushrooms and millions of various microorganisms.
Forests like these are almost untouched by the human hand and are known for their vast biological diversity. Subartonys Oak Grove and the surrounding forests are home to the spotted eagles, black storks and cranes. The hollows in the trees are greatly favored by tawny owls and Asio owls. Over 140 kinds of birds, 30 species of mammals and 9 species of fish can be found within the territory of Subartonys. Subartonys Oak Grove is also famous for two oaks inoculated together to form a single tree called the Vincukas Oak. This oak was inoculated by the renowned Lithuanian writer Vincas Krėvė- Mickevičius and his friend when the two were still children.
The men of the Village of Subartonys used to herd their horses to this Grove for the night and this was the usual road that Mickelio Vinckė took to school. According to the locals, Vincas Krėvė- Mickevičius was still a child when he and his friend inoculated two little oaks into a single tree now known as the Vincukas Oak.