Sukadeva Gosvami continued: Having thus spoken, the great saint Devarsi Narada returned to his asrama, known as Narayana-asrama, and Nalakuvara and Manigriva became twin arjuna trees - SB 10.10.23

Expressions researched:
"Śukadeva Gosvāmī continued: Having thus spoken, the great saint Devarṣi Nārada returned to his āśrama, known as Nārāyaṇa-āśrama, and Nalakūvara and Maṇigrīva became twin arjuna trees"

Srimad-Bhagavatam

SB Canto 10.1 to 10.13

Śukadeva Gosvāmī continued: Having thus spoken, the great saint Devarṣi Nārada returned to his āśrama, known as Nārāyaṇa-āśrama, and Nalakūvara and Maṇigrīva became twin arjuna trees.

SB 10.10.23, Translation and Purport

Śukadeva Gosvāmī continued: Having thus spoken, the great saint Devarṣi Nārada returned to his āśrama, known as Nārāyaṇa-āśrama, and Nalakūvara and Maṇigrīva became twin arjuna trees.

Arjuna trees are still found in many forests, and their skin is used by cardiologists to prepare medicine for heart trouble. This means that even though they are trees, they are disturbed when skinned for medical science.