🍄 Stem Block

Stem Block grows over time like a vanilla melon or pumpkin stem. On each random tick it advances one age stage. Once fully mature, it picks a random horizontal direction, checks that the block below is valid, and places a fruit there — then transforms itself into the attached_stem block facing the fruit.

Bone meal skips several age stages and, if the stem reaches max age, immediately attempts to grow the fruit.

Growth only happens within a light range — between light_requirement (low, default 0) and max_light_requirement (high, default 15).

Property Name	Property Type	Required
age	int	yes

Example

blocks:
  default:hami_melon_stem:
    behavior:
      type: stem_block
      fruit: default:hami_melon                              # the fruit block this stem produces (required)
      attached_stem: default:attached_hami_melon_stem        # the attached stem block to become (required)
      light_requirement: 0                                   # minimum light level for growth (default 0)
      max_light_requirement: 15                            # maximum light level for growth (default 15)
      fruit_bottom_blocks:                                   # blocks the fruit can sit on (whitelist)
        - minecraft:farmland
        - minecraft:dirt
      fruit_bottom_block_tags: []                            # block tags the fruit can sit on (whitelist)

info

fruit_bottom_blocks and fruit_bottom_block_tags use a whitelist — the fruit only grows if the block below the target position matches. An empty list means no block qualifies. This differs from bush_block which supports both blacklist and whitelist modes.