self-seeding, self-sowing
self-sown plants, volunteer seedlings
Самосев берёзы вырос прямо у забора.
A self-sown birch grew right by the fence.
Огород зарос самосевом сорняков.
The vegetable garden became overgrown with self-sown weeds.
В лесу часто встречается самосев ели.
Self-sown spruce trees are often found in the forest.
