A new cultivar of Dianthus plant named &lsquoFLORIAGATE&rsquo is characterized inter alia by pronounced spray habit, perennial and profuse bloom, and green foliage. Dianthus &lsquoFLORIAGATE&rsquo is suitable for use as a flowering plant in pots, containers, window boxes and the garden, but is primarily suited for the production of cut flowers. Dianthus &lsquoFLORIAGATE&rsquo is not hardy and is grown in a glasshouse. These traits set &lsquoFLORIAGATE&rsquo apart from all other existing varieties, lines, strains or sports of Dianthus. In particular, Dianthus &lsquoFLORIAGATE&rsquo has bright purple/violet flowers.