vines :
    # Frequencies: NONE, LOWEST, LOW, NORMAL, HIGH or HIGHER
    frequency : LOWEST
    # The list of vines types (separated by a comma)
    # You can write just the type or its percentage.
    # For instance, into a 1.16 server:
    #  -> single block type:    VINE
    #  -> multiple block types: VINE(70%),WEEPING_VINES(20%),TWISTING_VINES(10%)
    # -->> WEEPING_VINES will be placed at the bottom of a block
    # -->> TWISTING_VINES will be placed on the ground
    # For instance, into a 1.12 server:
    #  -> single block type:    VINE
    #  -> multiple block types: VINE(70%),...
    # 1.12.2 materials: https://helpch.at/docs/1.12.2/org/bukkit/Material.html
    # latest materials: https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/Material.html
    types : VINE
    # The list (separated by a comma) of blocks where the vines will be placed.
    # For instance, into a 1.13 server:
    #  -> single block type:    GRASS_BLOCK
    #  -> multiple block types: GRASS_BLOCK,DIRT,STONE,GRANITE,DIORITE,ANDESITE,OAK_LEAVES,SPRUCE_LEAVES,...
    # For instance, into a 1.12 server:
    #  -> single block type:    GRASS
    #  -> multiple block types: GRASS,DIRT,STONE,LEAVES,LEAVES_2,...
    # 1.12.2 materials: https://helpch.at/docs/1.12.2/org/bukkit/Material.html
    # latest materials: https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/Material.html
    walls : STONE,SANDSTONE