Forest cover in Lithuania has waxed and waned along with its fortunes; as a general rule, times of prosperity led to deforestation for agricultural uses.
This tendency was seen during the Soviet occupation; forest cover was about 20% in 1948, and increased to about 30% by 1990, when Lithuania regained its independence.
Birches constitute about 18% of the total, followed by Black Alder (about 8%) and European Aspen (about 8%); oak, ash, and elm make up the remainder.
Riparian and lacustrine (aquatic) flora present in Lithuania include duckweed, horsetails, bullrushes, sedges, and grasses.
The principal crop plants in Lithuania are rye, wheat, oats, barley, peas, potatoes, sugar beet, and flax.