This can be stated in active form. Alternate translation: "The enemy army will crush the proud drunkards of Samaria as if they were crushing flowers under their feet" (See: [[rc://en/ta/man/translate/figs-activepassive]])
A "garland" is a crown made of flowers. Here it represents the city of Samaria, the capital of Israel, which sits above a fertile valley. (See: [[rc://en/ta/man/translate/figs-metaphor]])
This speaks of the enemy soldiers seeing the beauty of Samaria and quickly plundering it as if they were a person who sees the first fig of the season and quickly eats it. (See: [[rc://en/ta/man/translate/figs-simile]])