Are you happy that it's finally FRONDESCENTIA?

What's "the word I'm thinking of"? Today, it's...

FRONDESCENTIA [FRON-dess-SEN-tee-UH] (noun)
It refers to the "leafing season", or the time of the year when plants unfold their leaves -- springtime, in other words.

"Frondescentia is the leafing of a plant; florescentia is, for like reason, the flowering of a plant."
--"The Analectic Magazine" (1817)