When half of the buds in a vine reaches this point, it is the stage of débourrement - the dictionary calls it "unfolding" and for the sake of understanding adds "of the buds".

Please remove spaces between words.
Whenhalfofthebudsinavinereachesthispoint,itisthestageofdébourrement-thedictionarycallsit"unfolding"andforthesakeofunderstandingadds"ofthebuds".