The time at which a plant unfolds its leaves.(noun)
The act of bursting into leaf.(noun)
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Use "frondescence" in a sentence
"[245] Engelmann makes use of the word frondescence in the same cases."
"Among _Leguminosæ_ a partial leafy condition (frondescence), or a more complete degree of the same change, (chloranthy) is not infrequent, particularly in _Trifolium repens_."
"= -- Engelmann [373] pointed out that, so far as flowers were concerned, there are two ways in which they assume a green colour, either by a simple development of chlorophyll in place of the colouring matter proper to the flower, or by an actual development of leaf-like organs in the room of the petals -- frondescence."