Among trees, the Aswatha is the most important. You can find aswatha tree almost in every Hindu temple
ಮೂಲತೋ ಬ್ರಹ್ಮರೂಪಾಯ ಮಧ್ಯತೋ ವಿಷ್ಣುರೂಪಿಣೇ
ಅಗ್ರತಃ ಶಿವರೂಪಾಯ ಅಶ್ವತ್ಥಾಯ ನಮೋ ನಮಃ
Moolatho brahma roopaya madhyatho visnu roopine,
Agratha Shiva roopaya, vruksha rajaya the nama.
Meaning:
Salutations to the king of trees,
Whose roots are Lord Brahma,
Whose stem is Lord Vishnu,
And whose crown is Lord Shiva.
Madhwa 
मूलतो ब्रह्मरूपाय मध्यतो विष्णुरूपिणे।
अग्रतः शिवरूपाय अश्वत्थाय नमो नमः।।
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