1) Flourish 2) French word used in English 3) Grow 4) Grow and flourish 5) Of plants, to bloom, bud 6) To grow or develop quickly 7) To grow or expand Found on https://www.crosswordclues.com/clue/burgeon
to grow or develop quickly; flourish: The town burgeoned into a city. He burgeoned into a fine actor. · to begin to grow, as a bud; put forth buds, shoots, etc., as a plant (often fol. by out, forth). Found on https://www.infoplease.com/dictionary/burgeon