13+ Redwood Sapling Minecraft

Redwoods is a better spawner category that contains by default the following biomes.

13+ Redwood Sapling Minecraft. This tree can measure 16x16 blocks at the bottom with a height of 140 or more blocks from the base. They can be made by planting a redwood seed in a filled plant pot, with a gardening trowel in your inventory.

Arborists Have Cloned Ancient Redwoods From Their Massive Stumps Yale E360
Arborists Have Cloned Ancient Redwoods From Their Massive Stumps Yale E360 from e360.yale.edu
So they added acacia and roofed forest saplings in the latest snapshots, now all we need are redwood tree saplings. Redwood saplings are used to grow redwood trees, with 90 farming (can be boosted, both potting and planting). I've searched around the internet to find the solution but none worked.

I've tried 1x1, 3x3, 4x4 and 7x7 and the saplings won't.

A single redwood tree requires a 7×7 array of saplings and can grow bigger than said 7×7 area. I've tried 1x1, 3x3, 4x4 and 7x7 and the saplings won't. Alder saplings cooked in an oven yield wood ash, and have a chance of producing reek of alder saplings can initially be acquired only by using mutandis on another planted sapling (does not matter. Redwood saplings drop from and are planted to create.