Minecraft wiki entry for Configured_feature, associated text: root_system—Generates a root column with a feature on top.
 required_vertical_space_for_tree: A value between 1 and 64.
 root_radius: A value between 1 and 64.
 root_placement_attempts: A value between 1 and 256.
 root_column_max_height: A value between 1 and 4096.
 hanging_root_radius: A value between 1 and 64.
 hanging_roots_vertical_span: A value between 1 and 16.
 hanging_root_placement_attempts: A value between 1 and 256.
 allowed_vertical_water_for_tree: A value between 1 and 64.
 root_replaceable: A block tag specifying which blocks can be replaced by the root column.
 root_state_provider: The block to use for the root column.
Block state provider[show]
 hanging_root_state_provider: The block to use hanging below the root column.
Block state provider[show]
 allowed_tree_position: The block predicate used to check if the tree position is valid.
 feature: The placed feature to place on top of the root system.