Made this by editing plump helmet raws. It probably works, and also probably grows more and faster than plump helmets.
[PLANT:BLUE_CUCUMBER_RAPSCALLIONS]
[NAME:blue cucumber rapscallion][NAME_PLURAL:blue cucumber rapscallions][ADJ:blue cucumber rapscallion]
[USE_MATERIAL_TEMPLATE:STRUCTURAL:STRUCTURAL_PLANT_TEMPLATE]
[MATERIAL_VALUE:3]
[MATERIAL_REACTION_PRODUCT:DRINK_MAT:LOCAL_PLANT_MAT:DRINK]
[MATERIAL_REACTION_PRODUCT:SEED_MAT:LOCAL_PLANT_MAT:SEED]
[BASIC_MAT:LOCAL_PLANT_MAT:STRUCTURAL]
[EDIBLE_VERMIN]
[EDIBLE_RAW]
[EDIBLE_COOKED]
[USE_MATERIAL_TEMPLATE:FRUIT:FRUIT_TEMPLATE]
[EDIBLE_VERMIN]
[EDIBLE_RAW]
[EDIBLE_COOKED]
[STATE_COLOR:ALL:BLUE]
[PICKED_TILE:3][PICKED_COLOR:1:0:0][DEAD_PICKED_TILE:182]
[GROWDUR:250][VALUE:2]
[USE_MATERIAL_TEMPLATE:DRINK:PLANT_ALCOHOL_TEMPLATE]
[STATE_NAME_ADJ:ALL_SOLID:frozen blue wine]
[STATE_NAME_ADJ:LIQUID:blue wine]
[STATE_NAME_ADJ:GAS:boiling blue wine]
[MATERIAL_VALUE:4]
[DISPLAY_COLOR:3:0:0]
[EDIBLE_RAW]
[EDIBLE_COOKED]
[PREFIX:NONE]
[DRINK:LOCAL_PLANT_MAT:DRINK]
[USE_MATERIAL_TEMPLATE:SEED:SEED_TEMPLATE]
[MATERIAL_VALUE:1]
[EDIBLE_VERMIN]
[EDIBLE_COOKED]
[SEED:blue cucumber rapscallion seed:blue cucumber rapscallion seeds:4:0:1:LOCAL_PLANT_MAT:SEED]
[SPRING][SUMMER][AUTUMN][WINTER]
[FREQUENCY:100]
[CLUSTERSIZE:12]
[PREFSTRING:tendency for lycanthropy]
[WET][DRY]
[BIOME:SUBTERRANEAN_WATER]
[UNDERGROUND_DEPTH:1:3]
[SHRUB_TILE:28]
[DEAD_SHRUB_TILE:28]
[SHRUB_COLOR:3:0:0]
[DEAD_SHRUB_COLOR:6:0:0]