A word for “flower” derived from primitive ✶galmā in notes on flowers in the same bundle containing Definitive Linguistic Notes (DLN) from 1959 (PE17/153). Initially Tolkien said alma meant both “a blessed thing and a flower”, then said that Q. almë was “a blessed thing” and alba was “flower” (< √GAL-AB), before saying that alma was “flower”. Tolkien implied that alma was a usual or general word for “flower” in Quenya. These same notes also said the word alda < ✶galadā was used mainly of flowering trees. It seems in this instance Tolkien connected the root √GAL (normally just “grow, flourish”) specifically to flowers, giving it the gloss “bloom” along with other glosses like “grow, flourish, be vigorous”.
Neo-Quenya: Elsewhere alda was the general word for a “tree” and √GAL had no special connection to flowers. I think alma as a “flower” word was a transient idea. I would use lótë “flower” instead for purposes of Neo-Quenya, since it is much better established.
alma (2) "flower" (PE17:153), said to be the "usual Quenya word" or "general Quenya word" (i.e. for flower), but its coexistence with #1 is problematic. Compare lós, lótë, lotsë, indil.