This data pack makes seeds, carrots, potatoes and trees replant themselves. When the seeds touch farmland they will plant.

Tree farm:
To remove a tree farm, remove the block beneath it. To collect from a tree farm, have a hopper beneath it or walk up to it. To place a sapling in the tree farm, throw the desired sapling onto it.

This datapack now starts automatically. (9/14/2021)

Resource pack is not required, but if you have downloaded do "/scoreboard players set texture seed.value 1"