Valmiki Ramayana Sundara Kanda Sarga 1 Shloka 13

शैलः the mountain, पादपमुक्तेन by those dropped down from the trees, सुगन्धिना full of fragrance, पुष्पौघेण heap of flowers, सर्वतः all over, संवृतः covered, यथा like, बभौ appeared, पुष्पमय: made of flowers.

With heaps of flowers full of fragrance fallen down from the trees all over the mountain, it looked as though it was a mountain of flowers.