Procedural trees shaped by your settings - LodeItems

A procedural tree is made up fresh each time it grows, from a few settings. Every tree comes out a little different, within the shape you describe, so a forest of them never looks copied and pasted. Only log and leaves are required: everything else has a default.

items/flora/willow/willow.yml

willow:
  type: flora
  tree:
    sapling: willow_sapling
    log: willow_log           # yours, or vanilla's like oak_log
    leaves: willow_leaves
    height: 7..11
    trunk-width-bottom: 2
    trunk-width-top: 1
    lean: 0.3
    branchiness: 0.5
    leaf-fluffiness: 0.7
    canopy: weeping
    roots: 0.4

Options

section

Key	Default	Does
`log`	required	The trunk and branch block.
`leaves`	required	The leaves block.
`height`	`5..8`	The trunk’s height in blocks: a number or a range like `7..11`, up to 64.
`trunk-width-bottom`	`1`	How thick the trunk is at the ground, 1 to 6 blocks. From 4 up its corners are cut off, so it reads round.
`trunk-width-top`	`1`	How thick it is at the top. The trunk narrows from the bottom width to this.
`lean`	`0.1`	How far the trunk bends away from straight up: `0` is straight, `1` bent far over.
`branchiness`	`0.3`	How many branches it has, and how long they are: `0` is none.
`leaf-fluffiness`	`0.5`	How big and full the clumps of leaves are: `0` small and ragged, `1` big and round.
`canopy`	`round`	The crown’s shape: `round` (like an oak), `cone` (like a spruce), `flat` (like an acacia) or `weeping` (like a willow).
`roots`	`0`	Logs spreading out along the ground round the base: `0` is none, `1` the most.
`seed`	random	A number or any word. With a seed, every tree of this kind grows into exactly the same shape.

Use /lodeitems tree <tree> ~ ~ ~ to try settings out: change them, /lodeitems reload, and grow another next to it.

Vanilla blocks only

A procedural tree can be made entirely of vanilla blocks, for example a weeping cherry:

weeping_cherry:
  type: flora
  tree:
    log: cherry_log
    leaves: cherry_leaves
    height: 5..7
    branchiness: 0.4
    leaf-fluffiness: 0.8
    canopy: weeping