Valmiki Ramayana Kishkindha Kanda Sarga 32 Shloka 13

कालविदाम् among the knowers of time, वर best, त्वम् you are, प्रमत्तः not alert, कालम् time, न जानीषे you are not aware, फुल्लसप्तच्छदश्यामा a lush green season with blossoming saptachada flowers, शिवा (शुभा) auspicious, शरत् autumn, प्रवृत्ता has set in.

'You knows best the passage of time (changing seasons). But you are not aware out of inattention that the auspicious autumn has set in, making the garden lush green with blossoms of Saptachada flowers.