Gardener's "Moonfire,” e.g. (6)

I believe the answer is:

dahlia

(Other definitions for dahlia that I've seen before include "Showy garden flower" , "Ali had (anag) - showy flower" , "Peculiar Ali had this flower" , "conspicuous bloomer" , "Showy flower from Mexico" .)

I've seen this clue in The Wall Street Journal.

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