godan verb (-ru), intransitive verb
grow thickly; be lush; be overgrown
Describes plants, leaves, or vegetation growing densely and vigorously, often with a sense of abundance or wildness.
夏になると庭の草が茂る。
In summer, the weeds in the garden grow thickly.
木の葉が茂って日陰ができた。
The tree leaves grew lush and created shade.